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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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f里含5的factor：5，10，15，20，25（两个5），30，一共7个5
f里含多于7个2，所以最多d在1到7之间，含7
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