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题库 / Prep2007E2-DS-200
If d is a positive integer and f is the product of the first 30 positive integers, what is the value of d ?
(1) 10d is a factor of f.
(2) d > 6
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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30！里面含有一个10，但是以5为因子的数较多----5，10，15，20，25，30，含有7个五，又有无数的2可以配对，5的7次方×2的7次方=10的7次方，所以f max=7，如果d大于6，那么结果是唯一且确定的，为7
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