C(9,6) = C(9,3) = 84
or combinations of 9 items taken 6 (or 3) at a time
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!
4 answers
Thank you @jollyrancher I don't know why I didn't do that before...
welcome
you have 9 options, 6 are the same and 3 are the same, so you do 9!/6!3!=84
3 answers