Posted by Hannah on .
One bag contains 5 red marbles, 4 blue marbles, and 3 yellow marbles, and a second bag contains 4 red marbles, 6 blue marbles, and 5 yellow marbles. If Lydia randomly draws one marble from each bag, what is the probability that they are both not yellow?

Math 
MathMate,
The two draws are independent.
So the probability of getting a yellow in both bags is the product of the probability of getting a yellow in each bag.
P1(Y)=3/12
P2(Y)=5/15
So
P(Y,Y)=P1(Y)*P2(Y) 
Math 
Anonymous,
ryrrr7o

Math 
Anonymous,
1/12

Math 
stephani,
4

Math 
Andrew,
The question asks the opposite... not yellow.
so 9/12 * 10/15 = .75 * .666 = 50% 
Math 
Marty Murray,
Andrew has it right.