【GMAT考满分数据洞察DS题库】If a and b are positive, is $$(a^{-1}+b^{-1})^{-1}_真题_答案

题目内容

If a and b are positive, is

$(a^{-1}+b^{-1})^{-1}$ less than

$(a^{-1}*b^{-1})^{-1}$ ?

(1)

$a = 2b$

(2)

$a + b > 1$

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.

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正确答案: B

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