Question

party!

Answer 1

heads or tails?

Answer 2

you need to know 2 probability P(E) = p and P(not E) = q E = event

you need to know how many repetitions

and how may farvourable you need.


the probability that event E will occur r times in n trials is

\[^{n}C _{r}q^{n-r}p^r\]

Answer 3

e.g. a bias die... P(6) = 1/3

find the probability of 3 6's in 4 rolls..

\[^{4}C _{3}(2/3)^1(1/3)^3\]