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5 October, 19:54

How many ways can a person toss a coin 13 times so that the number of heads is between 7 and 10 inclusive?

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  1. 5 October, 21:49
    0
    4004

    Step-by-step explanation:

    The number of combinations of choosing r objects from a group of n is nCr.

    So the number of ways to get 7, 8, 9, or 10 heads from 13 coin tosses is:

    ₁₃C₇ + ₁₃C₈ + ₁₃C₉ + ₁₃C₁₀

    = 1716 + 1287 + 715 + 286

    = 4004
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