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GMATprep PS question

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GMATprep PS question

by mlane25269 » Thu Jun 26, 2008 5:48 pm
Hi guys!

What is the answer on this one?
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by vishubn » Thu Jun 26, 2008 6:50 pm
Hi

5^21 * (2^2)^11/2=10^n
5^21 * 2 ^ 21=10^n
10^21=10^n
n=21

Hope this helps :)

cheers
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by mlane25269 » Thu Jun 26, 2008 9:12 pm
Hi,

I'm a little confused as to how you got the "11/2"?
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by anjaligeorge1 » Thu Jun 26, 2008 9:42 pm
5^21 * 4^11 = 2* 10^n

5^21 * (2^2)^11 = 2* 10^n


5^21 * (2)^22 /2 = 10^n

5^21 * (2)^21 =10^n

10^21 = 10^n

hence n = 21
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by mlane25269 » Thu Jun 26, 2008 10:40 pm
Ahhh that makes sense now!! Thanks for the explanation!!
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