Math Is Fun Forum

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hi gAr;

Busy with silly things around the house, chores and such. I am fine but the cold weather is not to my liking.

I have been playing with geogebra...

http://www.mathisfunforum.com/viewtopic.php?id=16837

Using the slider tool I could achieve 11 digits of accuracy with a construction! I wish they would use maxima or sage's as their numerical backbone so that it would have more than 15 digits available! It was like doing an iteration and a geometric construction and getting the right answer without knowing more than a bit about either!

How are you? I hope your changes will be constructive ones.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

New problem

10 pairs are formed from 10 girls and 10 boys at random.What is the probability of having at least one pair of boys?

A says)

B says) That is really close..

C says) I ran a simulation and A's answer is good.

D says) I got 1 / 2 as the probability.

E says)

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: What do you think?

Hi bobbym,

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hi gAr;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: What do you think?

Hi bobbym,

Thanks!

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hello gAr;

How have you been doing?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: What do you think?

Hi bobbym,

I'm doing fine.
How are you?

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Just the same. Working on problems I can not solve.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: What do you think?

Good to hear that!
I'm little deprived from math for now.

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

That is like being deprived of sleep or worse.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: What do you think?

That's true!
To worsen that, the people in the city are rude!

I'm trying the problem in the other thread, a good problem.

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Which one?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: What do you think?

The probability question that you posted a few hours ago.

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hi;

Happy solving!

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: What do you think?

Thank you!

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: What do you think?

hi bobbym

it's not inspired by,it's the same problem!

but why here? you normally post stuff that's very very hard,and this problem was given to juan as a part of a course (i guess).so at the risk of repeating myself:why here?

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hi;

Nope, it is not the same problem. His problem does not say anything about forming two shapes. Look at Bob's solution you will see what I mean.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: What do you think?

hi bobbym

i just noticed something.if the perimeter of both new shapes are 12 then their sum is 24 including the length of the line.but the perimeter of the triangle without the line is 24 which would mean the the line segment inside the triangle is 0.your question is contradictory!

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hi;

It is not contradictory at all. I said 12 and 12. This problem requires that the 2 perimeters and the two areas are both 12. Not just a line segment but the shape formed must be 12 and 12.

If your reasoning is correct then that just means you have solved the problem. The answer would be there is no line. You would be agreeing with B) who has another proof, an algebraic one.

You should post your idea in the other thread and see if that is what is asked for. If so, I will then remove my question here and the posts after it.

But are you sure you are right?

Asking Bob his interpretation of the juan problem is not the same as this problem here.

So what I will do is keep this question here and move it to the bottom after you and I have finished talking about it. Thanks for the input.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

6x + 8y = 48 intersects the y axis at A and the x axis at B. Can you draw a single line through the triangle OBA so that the 2 shapes formed by the drawn line have an area of 12 and a perimeter of 12?

Problem is scrapped because it has no solutions. Subsequent posts prove that.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: What do you think?

hi bobbym

now that one has a solution but i still do not like the phrasing,because you're saying that the perimeter of a shape has an area.i think the phrasing of the original juantheron's question is the best one-is there a line that splits the given triangle's both area and perimeter.

anyway,i'm trying to conjecture that all lines that split the perimeter intersect at a single point,although i think that this is not true.

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hi anonimnystefy;

because you're saying that the perimeter of a shape has an area

Yes, it did. I do not know how that got like that. I have changed the wording so that the ambiguity has been removed.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: What do you think?

but now it's the same as the question above it

the length of the line segment would again be 0.i still sticking to my choice of the best phrasing.

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: What do you think?

Hi;

Since the two shapes share the same one side it does not figure into the calculation. Also there is a solution so the 0 idea is not correct.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: What do you think?

hi

|\
|  \
|  /\
|/    \
"""""""

would you say that for these two triangles the line that divides them apart does not go into their perimeter.i wouldn't agree.

also,the edited question is the same as the one you posted first and is for the same reasons invalid in the sense that it doesn't have any solutions.

Last edited by anonimnystefy (2012-01-14 02:00:15)

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.