400-1816-180
本題由chris提供
If n is the product of the integers from 1
A. 10
B. 12
C. 15
D. 18
E. 20
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答案：
D
1到20中因數(shù)
里含有2的數(shù)有2、4、6、8、10、12、14、16、18、20十個(gè)數(shù)字。
其中，2、6、10、14、18中只有一個(gè)2（2=2*1,6=2*3等），這幾個(gè)數(shù)字中共有5個(gè)2.
在4和12、20中分別含有2的平方（4=2的平方，12=2的平方*3等），共有6個(gè)2.
8=2的三次方，則8含有3個(gè)2.
同理，16=2的四次方，16中有4個(gè)2.
所以含2的數(shù)字的總共有5+6+3+4=18個(gè) 
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