For each positive integer k, let ak=(1+1k+1). Is the product a1a2 . . . an an integer? n + 1 is a multiple of 3. n is a multiple of 2. _出国考试答疑器_GMAT

For each positive integer k, let

a_{k} = (1 + \frac{1}{k + 1})

. Is the product a₁a₂ . . . a_n an integer?

A、Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B、Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C、BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D、EACH statement ALONE is sufficient.

E、Statements (1) and (2) TOGETHER are NOT sufficient.

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老师为什么是选B不是选E呀?

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