math
posted by Anonymous on .
A bag contains 2 white marbles, 4 blue marbles, and 5 red marbles. Three marbles are drawn from the bag. What is the probability that not all of them are red?

First find the prob that ALL of them ARE red, which is
(6/11)(5/10)(4/9) = 2/33
So the prob that not all of them are red
= 12/33
=31/33 
There are 5 marbles in a box. One is black, one is yellow, one is red, one is purple and one is orange.
Please answer this 
The answer is 5 marbles in a box. One is black, one is yellow, one is red, one is purple and one is orange.

It will be 5/5 because it 's only one each