math

a pair of dice is rolled. what is the probabilty of each of the following? a. the sum of the numbers shown uppermost is less than 5. b. at least one six is cast.

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  1. out of 36 possible rolls, only 4 have the sum < 5:

    12 13 21 22

    What's the chance of no 6's?
    5/6 * 5/6
    so, take 1-P(~6,~6) = 11/36

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