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题库 / Prep2007E1-DS-5
If k is an integer and 2 < k < 8, what is the value of k ?
(1) k is a factor of 30.
(2) k is a factor of 12.
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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（1）3.5.6
（2)3,4,6
(1)((2)3,6也不充分
因数的个数=1+C(n,1)+C(n,2)+……+C(n,n)，如果因数里有m个相同的数字，减去包含相同数字的组合个数。