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题库 / Prep2007E1-DS-142
If x is a positive integer, what is the least common multiple of x, 6, and 9 ?
(1) The least common multiple of x and 6 is 30.
(2) The least common multiple of x and 9 is 45.
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:X=5,10,15,30,四个数和9的least multiple number都是90，，，答案唯一。正确
2：X=5,15,45，而6和9的least multiple number是18，，，所以5,15,45和18的least multiple number 都是90，，，，答案唯一。正确
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