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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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带入消数字剩下（n+3）/2对圈一，可为3可为6整个式子奇偶不确定，对于圈二是确定答案所以b
不是n+2/2 么
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