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I want to see different approaches to this problem If n

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I want to see different approaches to this problem If n [#permalink] New post 22 Apr 2006, 09:44
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I want to see different approaches to this problem

If n is a positive integer and n^2 is divisible by 72, then the largest positive integer that must divide n is.

A. 6
B. 12
C. 24
D. 36
E. 48
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 [#permalink] New post 22 Apr 2006, 10:50
B.

72 = 9 * 8 = 3^2 * 2^2* 2

Hence the largest possible interger = 3 * 2 * 2 = 12
  [#permalink] 22 Apr 2006, 10:50
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