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13 June, 16:51

Charlene has 12 plastic cups. Of the 12 plastic cups, 3 were green, 4 are red and 5 are blue. She stacks the cups into a single stack in random order. What is the probability that the cup on top of the stack is not green

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  1. 13 June, 17:09
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    The probability is calculated by dividing the non-green cups by the total of them:

    total = 12

    non-green = 4 + 5 = 9

    probability of non-green = 9/12 = 0.75 = 75%
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