
Concept explainers
To find:the probability both different colors balls.

Answer to Problem 32E
1115
Explanation of Solution
Given information:
The bag has one green, two yellow, and three red marbles.
Instead of finding the probability of drawing two marbles of different colors, find the probability that both marbles are of same color and then use the fact that probability of complement of an event A is given by P(A′)=1−P(A) to find the probability of drawing two marbles of different colors.
Total number of marbles =1+2+3=6
Now, first find the probability that both marbles are of yellow color.
Here each draw is independent, so take product of each event to find total probability.
P(both yellow)=26×15=115
Now, find the probability that both marbles are of red color.
Here each draw is independent, so take product of each event to find total probability.
P(both red)=36×25=15
Then, probability of drawing two marbles of same color is:
P(same color)=P(both yellow)+P(both red)=115+15=415
Lastly, the probability of drawing two marbles of different color is:
P(different color)=1−P(same color)=1−415=1115
Chapter 8 Solutions
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