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30 December, 16:15

A bag contains 10 black marbles, 20 white marbles, and 5 grey. you pick one without looking. what is the probability that the marble will be either white or grey

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  1. 30 December, 16:31
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    Black - 10/35 (2/7)

    White - 20/35 (4/7)

    Grey - 5/35 (1/7)
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