Is this cool with you?

bobbym · 2010-10-15 16:45:41

Hi Fruityloop;

How are you doing?
The proof is correct but it does use some calculus in the form of a Taylor expansion of e^(x+1).
But because it is you it is okay with me! Good work!

Fruityloop · 2010-10-15 17:39:18

You know what? After I posted I realized my solution doesn't conform to the conditions of the problem.

posted by Bobbym wrote:

But because it is you it is okay with me! Good work!

You are too kind!

Last edited by Fruityloop (2010-10-15 17:40:31)

bobbym · 2010-10-15 20:34:32

Hi Fruityloop;

I am not kind I am vicious. Or at least I am kind of vicious.

jimmyR · 2010-10-21 19:51:36

Hi bobbym;

She is on a roll.

Elaina wrote:

Hi bobbym;
First, I need to say congratulations on you second small publication on the (deleted).
Eric spotted it and said he was impressed. He said you were always the best in his mind.
I don't understand your reluctance to publish more. Jimmy told me you have nine or ten more like that.
Need I remind you that scientific work is to be shared.
I haven't moved in your complex yet and may require your help in doing so.

Last edited by jimmyR (2010-10-21 20:03:07)

bobbym · 2010-10-21 20:36:38

Hi Elaina;

You are correct for problem #147

You are also correct on problem #149 , nice use of Napiers identity.

Elaina wrote:

First, I need to say congratulations on you second small publication on the (deleted).

Thanks, but kindly refrain from mentioning details of my private life.

Elaina wrote:

Eric spotted it and said he was impressed. He said you were always the best in his mind.

Well, there you have it, I always said he was out of his mind and now I have evidence.
The men in the white coats will soon relieve his dementia.

Elaina wrote:

I don't understand your reluctance to publish more. Jimmy told me you have nine or ten more like that.
Need I remind you that scientific work is to be shared.

Just because you cannot understand something does not make it a viable alternative for me.JimmyR is correct but what of it.
I do not feel that the remaining ones are so important that the "scientific community" cannot do without them.
When I think something is interesting I will gladly publish it there, not before.
I do not need reminders from you.

bobbym · 2010-11-19 07:24:07

Hi 123ronnie321;

What did you get for the roots of x^3 -8x - 8 = 0 ?

123ronnie321 · 2010-11-21 03:29:40

Hi bobby,

sorry,
The roots of above equation are real and are -2, 1 + sqrrtt(5), 1 - sqrrtt(5).
and they do satisfy the conditions of the problem.

bobbym · 2010-11-21 08:40:55

Hi 123ronnie321;

Then you have solved the problem! Congratulations, that is the correct answer.

bobbym · 2010-12-14 02:28:10

Are there any integers that are perfect squares and when you reverse the digits are also a perfect square?

A says) I know everything about the integers, of course and there are an infinite amount of them.

B says) I am not so sure, at present I really do not know, but I doubt it.

C says) Yes! Here is a clue, the digits are 986 _ _ _ _ _ 36. You guess the middle 5.

D says) Whatever B says I disagree with. If he doubts it, there must be zillions of them.

A says) Here! Here!

phrontister · 2010-12-17 10:09:45

Hi Bobby,

Re perfect squares and their reverse...

bobbym · 2010-12-17 12:47:05

Hi phrontister;

bobbym · 2011-01-15 01:20:57

The elements of a sequence are bracketed like this:
(1)
(4,10,20)
(35,56,84,120,165,220)
(286,..........10 elements)
(.......15 elements.....)

Find the 3000 th number and in which bracket it appears. For instance the 7th number is 84 and it is in the third bracket.

A says) Impossible, for once I say you need a blasted computer.
B says) It is not too difficult, I have the answer.
C says) What are sequences?

Who is right? If you pick B you are going to have to find the number and the bracket it is in.

gAr · 2011-01-15 02:08:59

bobbym · 2011-01-15 02:24:36

Hi gAr;

Correct! That is very good!

gAr · 2011-01-15 02:45:47

Thanks bobbym,
Nice problem on tetrahedral numbers...

bobbym · 2011-01-15 10:06:56

Hi gAr;

Only 2 people solved it on 2 forums! That is odd.

gAr · 2011-01-15 15:14:27

Hi bobbym,

There may be people who know and choose not to post the same solution again. They may post a solution if they find another way of solving it...

bobbym · 2011-01-16 18:35:15

Each school in the city sent a team of 3 students to a mathematics contest. A, B and C were on the same team. Each participant in the contest received a different score. A's score was the median among all students, and his was the highest score on his team. B placed 37 and C placed 64th.

A says) There was 32 teams in the contest.
B says) That is not how many there were, it was less than that.
C says) B is right that is not right, I counted them and it was 30 teams.
A says)No wonder I scored the highest.

How many teams were sent?

gAr · 2011-01-16 19:28:20

bobbym · 2011-01-16 19:30:40

Yeparoo! Very good! How did you figure it?

gAr · 2011-01-16 19:38:49

bobbym · 2011-01-16 19:40:22

Good! I like it.

gAr · 2011-01-16 19:49:48

thank you:)

bobbym · 2011-01-17 19:11:43

A man wants to get from A to B. He wants to make only up and right moves. Obviously going left or down are wastes of time.

A says) There are 540 ways to go from A to B.
B says) I do not know.
C says) Why do people want to move around?
D says) A is wrong but I cannot prove it.

Can you prove A is wrong by finding out the number of paths? The red grid lines are the streets.

gAr · 2011-01-17 21:41:19

Hi,

Last edited by gAr (2011-01-18 14:44:37)

Math Is Fun Forum

#151 2010-10-15 16:45:41

Re: Is this cool with you?

#152 2010-10-15 17:39:18

Re: Is this cool with you?

#153 2010-10-15 20:34:32

Re: Is this cool with you?

#154 2010-10-21 19:51:36

Re: Is this cool with you?

#155 2010-10-21 20:36:38

Re: Is this cool with you?

#156 2010-11-19 07:24:07

Re: Is this cool with you?

#157 2010-11-21 03:29:40

Re: Is this cool with you?

#158 2010-11-21 08:40:55

Re: Is this cool with you?

#159 2010-12-14 02:28:10

Re: Is this cool with you?

#160 2010-12-17 10:09:45

Re: Is this cool with you?

#161 2010-12-17 12:47:05

Re: Is this cool with you?

#162 2011-01-15 01:20:57

Re: Is this cool with you?

#163 2011-01-15 02:08:59

Re: Is this cool with you?

#164 2011-01-15 02:24:36

Re: Is this cool with you?

#165 2011-01-15 02:45:47

Re: Is this cool with you?

#166 2011-01-15 10:06:56

Re: Is this cool with you?

#167 2011-01-15 15:14:27

Re: Is this cool with you?

#168 2011-01-16 18:35:15

Re: Is this cool with you?

#169 2011-01-16 19:28:20

Re: Is this cool with you?

#170 2011-01-16 19:30:40

Re: Is this cool with you?

#171 2011-01-16 19:38:49

Re: Is this cool with you?

#172 2011-01-16 19:40:22

Re: Is this cool with you?

#173 2011-01-16 19:49:48

Re: Is this cool with you?

#174 2011-01-17 19:11:43

Re: Is this cool with you?

#175 2011-01-17 21:41:19

Re: Is this cool with you?

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