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22 September, 11:50

Type the correct answer in the box, Write your answer as a reduced fraction, using / for the fraction bar.

A six-sided fair die is rolled 4 times in a row. The probability of getting a 4 only on the last trials

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  1. 22 September, 12:06
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    P = 125/1296

    Step-by-step explanation:

    P = Number of ways of getting only 4 at the last trial / Total number of ways

    Number of ways of getting only 4 at the last trial = 5 * 5 * 5 * 1 = 125

    (for the first three trials, all but 4 is permissible (6 - 1 = 5 ways), and

    for the last trial, only 4 is permissible (1 way)).

    Total number of ways = 6 * 6 * 6 * 6 = 1296

    P = 125/1296
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