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题库 / GMATLA-DS-23
If a and b are positive, is~$(a^{-1}+b^{-1})^{-1}$~ less than ~$(a^{-1}b^{-1})^{-1}?$~
(1) ~$a = 2b$~
(2) ~$a + b > 1$~
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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只说了a.b 是正数，没说是正整数
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