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31 March, 10:05

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

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  1. 31 March, 10:20
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    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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