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题库 / Prep2007E1-DS-131
The positive integer k has exactly two positive prime factors, 3 and 7. If k has a total of 6 positive factors, including 1 and k, what is the value of k ?
(1) 32 is a factor of k.
(2) 72 is not a factor of k.
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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n拥有1、k、3、7、21（3*7），这五个因数。这是确定了的条件。
因为n只有6个因数，所以第六个因数要么是3^2，要么是7^2，
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