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9 December, 22:23

a bag contains 3 red 5 yellow and 7 purple marbles find the probability of drawing a purple marble followed by a red marble the first marble is put back in the bag between draws

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  1. 9 December, 22:38
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    Required probability = 7/75.

    Step-by-step explanation:

    Probability (purple marble) = 7/15 (as there are 7 marbles out of a total of 15.)

    Probability (red marble) = 3/15 = 1/5.

    So the probability of a purple being drawn followed by a red marble

    = 7/15 * 1/5

    = 7 / 75 (answer).

    Note: the 2 probabilities are multiplied because the 2 draws are independent of each other.
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