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Divisble by 5

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by Bill@VeritasPrep » Sun May 06, 2012 8:27 am
We need to know that x is an integer. If x is a decimal, then we could end up with decimal values for our terms, i.e. 9^2.2=~125.7
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by klmehta03 » Sun May 06, 2012 11:53 am
IMO A .
OA pls?
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by dipzzz » Sun May 06, 2012 8:33 pm
OA D
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by bryan88 » Fri May 11, 2012 9:15 pm
Dont we get 9^(x) *66430 on expansion.

This is anyway divisible by 5.

Am i missing something?
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by lathmanu » Sat May 12, 2012 12:48 am
bryan88 wrote:Dont we get 9^(x) *66430 on expansion.

This is anyway divisible by 5.

Am i missing something?
Yes the Question can be written as 66430*(9^x)

I would refer to Bill's reply.
We need to know that x is an integer.
Bill@VeritasPrep wrote:We need to know that x is an integer. If x is a decimal, then we could end up with decimal values for our terms, i.e. 9^2.2=~125.7
I first took B as the answer.
But after seeing the original answer as D, I realized that if 5 is a factor of x, then x is an integer.
A is also sufficient.

Thanks for the question dipzzz
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by ihatemaths » Sat May 12, 2012 5:30 am
how do you people get 66430 ? did you compute fully ?
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