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25 November, 09:58

Distinct four-letter sequences are formed by picking 4 letter tiles from a bag containing 11 different alphabet tiles. Note that the order in which the letters are picked matters. The probability of getting a particular four-letter sequence is.

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  1. 25 November, 10:35
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    4 of them

    11 choices

    slot method

    1st slot: 11 choices

    2nd slot: 10 choices (1 picked)

    3rd slot: 9 choices (1 more picked)

    4th slot: 8 choices (1 more picked)

    11*10*9*8=7920

    7920 ways

    so the probabity is

    1/7920
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