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Q: A coin is tossed 9 times. How many ways could the result be 6 heads and 3 tails?

Answer is 84 ways

If you could explain the process on how you get the answer that would be really helpful because I always get stuck on this kind of question... thanks!

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  1. C(9,6) = C(9,3) = 84

    or combinations of 9 items taken 6 (or 3) at a time

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  2. Thank you @jollyrancher I don't know why I didn't do that before...

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  3. welcome

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  4. you have 9 options, 6 are the same and 3 are the same, so you do 9!/6!3!=84

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