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05-04-2020
Mathematics

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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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MathPhys MathPhys

05-04-2020

Answer:

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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