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15 July, 06:59

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 7 8. There are 72 marbles in total in the bag and each is equally likely to be chosen. Work out how many red marbles there must be.

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  1. 15 July, 07:17
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    63 red marbles.

    Step-by-step explanation:

    Because the probability of drawing a red marble is 7/8, the number of red marbles = 7/8 * 72

    = 7 * 9

    = 63.
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