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20 November, 06:13

Using a sixteen-sided number cube, what is the probability that you will roll an even number or an odd prime number? Round to three decimals

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  1. 20 November, 09:20
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    When there is a probability this OR that, the individual probabilities are added.

    probability of rolling an even number is 1/2

    prime numbers between 1-16 are {2, 3, 5, 7, 11, 13} of these five are odd.

    probability of rolling an odd prime number

    5/16

    probability of even OR odd prime

    1/2 + 5/16

    8/16 + 5/16 = 13/16

    13/16 = 0.825
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