Question

A bag contains 16 coloured balls. Six are green, 7 are red and 3 are white. A ball is chosen, without looking into the bag. Find the probability that the ball chosen is not red.

Answer 1

Balls in the bag = 16 = Number of balls that could be drawn 

n(S) = 16 

Not a red ball = 16 – number of red balls = 16 – 7 = 9 = E 

n(E) = 9 

Probability of not drawing a red ball = `(n(E))/(n(S)) = 9/16`