Mathematics, 06.08.2021 20:10 jetblackcap

There are 2 green pens, 3 blue pens, 4 red pens, and 1 black pen in the teachers desk. The teacher selects 2 pens at random, and the pens are not replaced. What is the probability that the teachers will pick 2 red pens in a row?

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There are 2 green pens, 3 blue pens, 4 red pens, and 1 black pen in the teachers desk. The teacher s...