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题库 / GMATAdvanced-DS-8
For each positive integer k, let ak =(1+~$\frac{1}{k+1}$~ )Is the product a1,a2...an an integer?
(1)n+ 1 is a multiple of 3.
(2)n is a multiple of 2.
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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整理式子，a1...an的乘积=(n+2)/2,题目要求是否为整数，即要求n+2是否为2的倍数，即n是否为偶数；条件1中，当n+1=6时，n=5,则不满足要求，条件2满足，选B
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