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# What is the largest positive integer n for which 20! is a multiple of

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Re: What is the largest positive integer n for which 20! is a multiple of [#permalink]
Bunuel wrote:
What is the largest positive integer n for which 20! is a multiple of 2^n ?

(A) 10
(B) 15
(C) 17
(D) 18
(E) 20

20/2 = 10
10/2 = 5
5/2 = 2
2/2 = 1

So, n = 10+5+2+1 => 18, Answer will be (D)
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Re: What is the largest positive integer n for which 20! is a multiple of [#permalink]
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Re: What is the largest positive integer n for which 20! is a multiple of [#permalink]
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