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A box contains 3 red and 7 green marbles. If 9 marbles are drawn without replacement,...

A box contains 3 red and 7 green marbles. If 9 marbles are drawn without replacement, what is the expected number of red marbles?

HINT: Let X be the number of red marbles drawn. First find the Range and p.m.f. of X and use Wolfram-Alpha to simplify the fractions.

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