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题库 / Prep2007E2-DS-30
If n is an integer, is ~$\frac{n}{7}$~ an integer?
(1) ~$\frac{3n}{7}$~ is an integer.
(2) ~$\frac{5n}{7}$~ is an integer.
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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3和7 是互斥的，5和7也是互斥的。肯定可以整除。