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  • 解數雜貨店
    2020-08-15 07:56:41
    There are 4 coins. Let’s label them as 2a, 2b, 5a, 5b. Count the favorable outcomes, {(2a, 5a), (2a, 5b), ...} Then count all the possible outcomes, {(2a, 2b), (2a, 5a), ...} Their ratio is the desired probabilty
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