Question

A ball is drawn at random from a box containing 12 white, 16 red and 20 green balls. Determine the probability that the ball drawn is red or white.

Answer 1

Total number of balls in the box = 48  

Total possible outcomes on drawing a ball = 48 

n(S) = 48 

red or a white ball = 12 + 16 = 28 balls 

Event of drawing a red or white ball = E = 28 

n(E) = 28 

Probability of not drawing a green ball = `(n(E))/(n(S)) = 28/48 = 7/12`