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What is the smallest positive integer k for which 784 is a factor of 14k?
What is the smallest positive integer k for which 784 is a factor of 14k?
admin
2022-12-19
25
问题
What is the smallest positive integer k for which 784 is a factor of 14
k
?
选项
A、6
B、8
C、4
D、5
E、10
答案
C
解析
784=2
4
×7
2
,14
k
=2
k
×7
k
要使784是14
k
的一个因子,那么14
k
就至少需要有4个质因子2,2个质因子7,因此k最少需要为4,选择C。
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本试题收录于:
GMAT QUANTITATIVE题库GMAT分类
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