A box contains 25 yellow, 27 green and 29 red jelly beans.
If 10 jelly beans are selected at random, what is the probability that:
6 are yellow?
6 are yellow and 3 are green?
At least one is yellow?
A box contains 24 yellow, 25 green and 27 red jelly beans.
If 15 jelly beans are selected at random, what is the probability that:
a) 5 are yellow?
b) 5 are yellow and 9 are green?
c) At least one is yellow?
I'm unsure of the techniques needed for these, any suggestions are welcome.