Math Is Fun Forum

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

Last edited by phrontister (2010-04-10 12:37:58)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

ZHero

Real Member

Registered: 2008-06-08

Posts: 1,889

Re: Is this cool with you?

Hi ZHero;

Sorry, can't even copy my own problem correctly. I have fixed the...

hi Bobbym!

You need to Double Check, Triple Check or say "n times" Check ur posts.

Don't be Sorry... Just Admit ur Mistake and be a lil'bit More Careful from next time!  

Last edited by ZHero (2010-04-09 04:53:26)

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If two or more thoughts intersect, there has to be a point!

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi;

For the problem in post # 75

You are both right, A,B,C are all wrong the answer is 8.

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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: Is this cool with you?

Hi;

If r1, r2 and r3 are the roots of

and a ≠ 0 and

find a.

A says) No solutions.

B says) There are many answers for a but only one integer answer.

C says) There is only one answer for a.

D says) There are many answers but none of them are integers.

Who is right?

---

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: Is this cool with you?

Hi;

How many solutions are there to xyz = 360 when x ≠ y ≠ z and x,y,z > 0 ?

A) says 180
B) says 360
C) says 126
D) says 168

Who is right, hide your answers and back them up.

---

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.

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

Last edited by phrontister (2010-04-22 03:17:50)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

That's correct! Very good!

---

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: Is this cool with you?

Hi;

What is the smallest integer that when cubed has it's last 4 digits the same?

A says ) 9999

B says ) There are some that are smaller than that.

C says ) There is only 2 smaller numbers.

Who is right and why?

---

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.

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

Last edited by phrontister (2010-04-23 12:43:35)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi phrontister;

That is correct! What does your LB code look like?

---

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.

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi;

---

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.

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

That's a neat trick!

Same answers as mine, and it took 18% less time.

Last edited by phrontister (2010-04-24 00:10:10)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi phrontister;

Usually string operations, like converting integers to strings are very slow in almost every language. When possible work with integers, they are faster.

A tough one so be careful:

What is the smallest n, that n^3 has 4444 at the end?

A says ) No cube has 4444 on the end.

B says ) Of course there is some cube with 4444 on the end.

C says ) There are an infinite number of them but they are all 30 digits or more.

---

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.

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

Last edited by phrontister (2010-04-24 03:58:21)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi phrontister;

That is correct, can you give an old man a little help with your explanation? I am not following it.

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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.

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

Last edited by phrontister (2010-04-25 11:22:03)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi phrontister;

---

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.

ZHero

Real Member

Registered: 2008-06-08

Posts: 1,889

Re: Is this cool with you?

Last edited by ZHero (2010-04-24 19:06:33)

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If two or more thoughts intersect, there has to be a point!

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi ZHero;

Your solution is a real killer. It is devastating. I didn't think of that. Looks like a large happy face eating the earth.

---

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.

ZHero

Real Member

Registered: 2008-06-08

Posts: 1,889

Re: Is this cool with you?

yeah.. that was the result when i tried to run a simple program in

Language on my

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If two or more thoughts intersect, there has to be a point!

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

I had already done something similar to yours:

Last edited by phrontister (2010-04-25 11:29:16)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

There is a shorter proof of this that doesn't use a computer. Unfortunately I can't remember what it is or how I derived it. I will post it when I do. Good work, by the way.

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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.

phrontister

Real Member

From: The Land of Tomorrow

Registered: 2009-07-12

Posts: 4,877

Re: Is this cool with you?

Hi Bobby,

Last edited by phrontister (2010-04-25 15:17:17)

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"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Is this cool with you?

Hi phrontister;

Do you have some idea in mind?

---

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.