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Given that a and b are real numbers such that $-3\leq a\leq1$ and $-3\leq b\leq 1$, and values for $a$ and $b$ are chosen at random, what is the probability that the product $a\cdot b$ is positive? Express your answer as a common fraction.

 Sep 29, 2021
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The areas in the following should help:

 

 Sep 29, 2021

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