I don't understand this question

Andy Braham asked Dec 24, 2023

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15 votes

Andy Braham asked Dec 24, 2023

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21 votes

The probabilities of all possible outcomes must sum to 1. So the missing probability is

1 - 1/2 - 3/10 - 1/20 = (20 - 10 - 6 - 1)/20 = 3/20

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