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From: Sanny on 5 Apr 2010 02:55
I was boasting about my Physics/ Maths to a small girl appearing for
IIT [Engineering School]

I solved many Maths/ Physics Problems.

But then she gave me a difficult question. That I could not solve.

She had the answer at back of the booklet. She told me some formula.
But I was not convinced.

Here is the Question.

lim (x-> 2) [x^n - 2^n] / [x-2] == 80

In the above equation what is the value of "n"

Solve it and tell me?

Bye
Sanny

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From: Ray Vickson on 5 Apr 2010 03:21
On Apr 4, 11:55 pm, Sanny <softtank...(a)hotmail.com> wrote:
> I was boasting about my Physics/ Maths to a small girl appearing for
> IIT [Engineering School]
>
> I solved many Maths/ Physics Problems.
>
> But then she gave me a difficult question. That I could not solve.
>
> She had the answer at back of the booklet. She told me some formula.
> But I was  not convinced.
>
> Here is the Question.
>
> lim (x-> 2) [x^n - 2^n] / [x-2] == 80
>
> In the above equation what is the value of "n"
>
> Solve it and tell me?

This problem is trivial; you should be able to solve it yourself,
especially if you are 1/10 as good think you are.

R.G. Vickson

>
> Bye
> Sanny
>
> Ask your Physics Question:http://www.getclub.com/Problems.php?cat=Physics
>
> Or Earn money Solving others Questions.http://www.getclub.com/Problems.php?cat=Physics

From: Sanny on 5 Apr 2010 03:32
> > Here is the Question.
>
> > lim (x-> 2) [x^n - 2^n] / [x-2] == 80
>
> > In the above equation what is the value of "n"
>
> > Solve it and tell me?
>
> This problem is trivial; you should be able to solve it yourself,
> especially if you are 1/10 as good think you are.

The girl told me a formula using that it can be solved in 5 sec.

But I am not convinced with that formula.

1. From where that formula came?

2. That formula is very generalized only to solve this question. Its
like memorizing all multiplication tables instead of using a
calculator.

I want it to be solved without use of any formula. But be solved as an
original problem.

Can you solve it without using any artificial formula.

Incase there is a formula can you derive that formula?

Bye
Sanny

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From: Helmut Wabnig hwabnig on 5 Apr 2010 03:42
On Sun, 4 Apr 2010 23:55:53 -0700 (PDT), Sanny
<softtanks22(a)hotmail.com> wrote:

>I was boasting about my Physics/ Maths to a small girl appearing for
>IIT [Engineering School]
>
>I solved many Maths/ Physics Problems.
>
>But then she gave me a difficult question. That I could not solve.
>
>She had the answer at back of the booklet. She told me some formula.
>But I was not convinced.
>
>Here is the Question.
>
>lim (x-> 2) [x^n - 2^n] / [x-2] == 80
>
>In the above equation what is the value of "n"
>
>Solve it and tell me?
>
>Bye
>Sanny
>
>Ask your Physics Question:
>http://www.getclub.com/Problems.php?cat=Physics
>
>Or Earn money Solving others Questions.
>http://www.getclub.com/Problems.php?cat=Physics



n = 5

don't you see?


w.
From: Sanny on 5 Apr 2010 03:53
> n = 5

I knew the answer is 5 and the formula used.

I am asking how that formula came?

Please solve it in steps.

I had left Mathematics 20 years back and I have never read a Math book
for last 20 years So dont accept me to remember all formulas.

Bye
Sanny

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