This is your question number 2 for today, out of 5 allowed.
Here's your question for category 'Probability-and-statistics'.
16 teams decided to participate in a football competition. In the preliminary round, the 16 teams will br divided into 4 groups and they have to compete with each other within group. The winner of the group will proceed to the semifinal.

Find the number of ways to form the 4 groups.

(Answer: 63063000)

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  1. C(16,4) = 16! / [ (16-4)!(4!) ]


    = 4 * 5 * 7 * 13

    = 1280

    Oh well

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