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23 September, 21:34

A three-character code uses the letters D and Q. Either of the letters may be repeated.



Find the probability of a code with exactly two D's.

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  1. 23 September, 23:28
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    1/1 x 1/2 x 1/2 = 1/4

    One times One-Half times One-Half Equals One-Fourth

    The Probability is 1/4 or One-Fourth.

    Step-by-step explanation:

    There is a One-Half possibility on two of them for choosing D.

    Multiply that by each other and than by 1.
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