3 years ago

A box contains 5 red and 5 green marbles. if 5 marbles are drawn without replacement, what is the expected number of red marbles

1 answer:

4 0

P( 5 reds, 1 green) = 6C3*P(drawing the red ones 1st, 2nd, 3rd 4th) = 6C5(5/10)(4/9)(3/8)(2/7)(1/6)(5/5) = 1/42

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