A bag contains 7 white, 9 black, and 10 green balls. What is the probability that a ball drawn at random from the bag is white W or green G?
A) Pr(W∪
G) =
B) Pr(W∪
G) =
C) Pr(W∪
G) =
D) Pr(W∪
G) =
E) Pr(W∪
G) =

Question

A bag contains 7 white, 9 black, and 10 green balls. What is the probability that a ball drawn at random from the bag is white W or green G? ​
A) Pr(W∪
G) = 
B) Pr(W∪
G) = 
C) Pr(W∪
G) = 
D) Pr(W∪
G) = 
E) Pr(W∪
G) =

Quizplus · Accepted Answer

The total number of balls in the bag is:

7 + 9 + 10 = 26

The probability of selecting a white or green ball is:

P(W∪G) = P(W) + P(G)

where P(W) is the probability of selecting a white ball and P(G) is the probability of selecting a green ball.

P(W) = 7/26

P(G) = 10/26

P(W∪G) = P(W) + P(G) = 7/26 + 10/26 = 17/26

Therefore, the correct answer is:

Pr(W∪G) = 17/26 = 11ea984b_ad5e_0336_9029_33f209f0afeb_TB4005_11 (B)

A Bag Contains 7 White, 9 Black, and 10 Green