Posted by KiKi on .
A bag contains 7 red chips and 10 blue chips. Two chips are selected randomly without replacement from the bag. What is the probability that both chips are red?

math/probability 
PsyDAG,
Once the first red chip has been picked, there are only 16 total chips and 6 red chips remaining.
To find the probability that both (all) events occur, you need to multiply the probabilities of the individual events.
7/17 * 6/16 = ? 
math/probability 
Hannah,
A box contains 25 yellow, 28 green and 38 red jelly beans.
If 13 jelly beans are selected at random, what is the probability that:
a) 5 are yellow?
b) 5 are yellow and 7 are green?
c) At least one is yellow? 
math/probability 
Ben,
the anwser is 4