Mathematics

Mathematics, 16.01.2022 06:50, MJKjmkp1

A box contains 4 red pens,5 black pens, and 3 blue pens. If Robert selects one pen, and then another pen without putting the first pen back in the box, what is the probability that both pens will be black?

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A box contains 4 red pens,5 black pens, and 3 blue pens. If Robert selects one pen, and then another...

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