作者catspace (柏拉圖的永恆...)
看板GMAT
標題Re: [計量] GWD幾題請教
時間Sat Sep 27 17:33:28 2008
: GWD-01-Q15
: If p is the product of the integers from 1 to 30, inclusive, what is the
: greatest integer k for which 3^k is a factor of p?
: A.10
: B.12
: C.14
: D.16
: E.18
: 請問有快速的算法嗎 ANS:C
3 => 3^1
6 => 3^1
9 => 3^2
12 => 3^1
15 => 3^1
18 => 3^2
21 => 3^1
24 => 3^1
27 => 3^3
30 => 3^1
----------
總共最多 3^14 #
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