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11 July, 14:21

A box contains 9 new light bulbs and 6 used light bulbs. Each light bulb is the same size and shape. Meredith will randomly select 2 light bulbs from the box without replacement. What is the probability Meredith will select a new light bulb and then a used light bulb

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  1. 11 July, 15:41
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    (9/35) = 0.257

    Explanation:

    Box contains 9 new light bulbs and 6 used light bulbs, total number of bulbs = 15.

    Probability of selecting two bulbs; a new light bulb and then, a used light bulb in that order = [ (probability of selecting a new bulb) * (probability of selecting a used bulb from the rest) ] = [ (9/15) * (6/14) ] = (9/35) = 0.257
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