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17 October, 19:49

You have a well-shuffled 52-card deck. on average, how many pairs of adjacent cards are there such that both cards are red?

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  1. 17 October, 20:18
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    Pair 1: A & 2

    Pair 2: 2 & 3

    Pair 3: 3 & 4

    Pair 4: 4 & 5

    Pair 5: 5 & 6

    Pair 6: 6 & 7

    Pair 7: 7 & 8

    Pair 8: 8 & 9

    Pair 9: 9 & 10

    Pair 10: 10 & J

    Pair 11: J & Q

    Pair 12: Q & K

    Pair 13: K & A

    There are 13 pairs in Diamond & 13 pairs in Heart,

    So, Total pairs are 26,

    Therefore, 26 is the correct answer.
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