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19 September, 06:28

A fair die with sides numbered 1, 2, 3, 4, 5, and 6 is to be rolled until a number greater than 4 first appears. what is the probability that a number greater than 4 will first appear on the third or fourth roll

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  1. 19 September, 06:32
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    First two rolls have to be 1-4 that is 2/3 chance twice and the third can be 4or 5

    2/3*2/3*1/3 + the chance that the fourth is the 5 or 6.

    2/3*2/3*2/3*1/3

    So the solution is : P=2/3*2/3*1/3 + 2/3*2/3*2/3*1/3
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