【GMAT考满分数据洞察DS题库】The sequence $$a_1, a_2, a_3, . . . ,a_n$$ of n in_真题_答案

题目内容

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The sequence

$a_1, a_2, a_3, . . . ,a_n$ of n integers is such that

$a_k = k$ if k is odd and

$a_k = -a_{k-1}$ if k is even. Is the sum of the terms in the sequence positive?

(1) n is odd.

(2)

$a_n$ is positive.

AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
CBOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
DEACH statement ALONE is sufficient.
EStatements (1) and (2) TOGETHER are NOT sufficient.

正确答案: D

正确率： 73%

难度：

选择材料题号

PREP07 Test 1

SET 1

题目来源

题目来源1:PREP07 Test 1

GMAT 考满分题库