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by sanju09 » Thu Sep 16, 2010 10:05 pm
What is the greatest value of a positive integer n such that 3^n is a factor of 18^15 ?
(A) 15
(B) 18
(C) 30
(D) 33
(E) 45

[spoiler]Source: https://www.west.net/~stewart/gmat

this source contains many questions deleted from BTG, this is one of those I guess[/spoiler]
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by selango » Thu Sep 16, 2010 11:55 pm
18^15=(3^2*2)^15=2^15*3^30

n=30.

Pick C
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by goyalsau » Thu Sep 16, 2010 11:59 pm
One more C.
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by lokesh r » Fri Sep 17, 2010 8:10 am
IMO C.
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