Given an urn containing 3 red balls, 4 green balls, and 5 yellow balls. What is the probability of drawing either a red ball or a green ball on a single draw?
A) 7/12
B) 1/2
C) 2/5
D) 2/3
E) 3/7

Question

Quizplus · Accepted Answer

The total number of balls is 3 (red) + 4 (green) + 5 (yellow) = 12. The probability of drawing a red or green ball is the sum of the probabilities of drawing a red ball and drawing a green ball, which is (3 + 4) / 12 = 7 / 12.

Given an Urn Containing 3 Red Balls, 4 Green Balls