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24 June, 10:35

A Girl Scout is selling cookies. She currently has 3 boxes of Thin Mints, 4 boxes of Tag-Alongs, and 5 boxes of Somoas left. What is the probability that a customer will randomly buy two of the same box of cookie to purchase?

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  1. 24 June, 12:25
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    Probability that customer will buy 2 boxes of Thin Mints: 3/12*2/11=6/132

    Probability that customer will buy 2 boxes of Tag-Alongs: 4/12*3/11=12/132

    Probability that customer will buy 2 boxes of Somoas: 5/12*4/11=20/132

    Thus the probability in total is 6/132+12/132+20/132=28/132=28.7879%
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