【GMAT考满分数据洞察DS题库】If r 1 _真题_答案

题目内容

If $r_{1}$ and $r_{2}$ are the roots of the equation $t^{2} + b t + c = 0$ , where b and c are constants, are both $r_{1}$ and $r_{2}$ 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 statements 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: D

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