推 k1091133:就1~20有幾個2吧?我算是18? 04/12 00:31
If n is the product of integers from 1 to 20 inclusive what is the greatest
integer k for which 2^k is a factor of n?
A. 10
B. 12
C. 15
D. 18
E. 20
請問這題該怎麼解
想了好久 沒有頭緒
謝
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