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Exponents - GMATPrep

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Re: Exponents - GMATPrep

by jayhawk2001 » Sun Jun 10, 2007 10:03 am
diegoasaavedra wrote:If 5^21 x 4^11 = 2 x 10^n what is the value of n?

a- 11
b- 21
c- 22
d- 23
e- 32

Answers is B, but I don't remember how to do it.

Thanks
5^21 * 4^11
= 5^21 * 2^22
= 2 * 5^21 * 2^21
= 2 * 10^21

Hence B
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