Question

A bag contains 3 red balls, 4 blue balls and 1 yellow ball, all the balls being identical in shape and size. If a ball is taken out of the bag without looking into it; find the probability that the ball is not yellow.

Answer 1

Total number of balls in the bag = 3 + 4 + 1 = 8 balls 

Number of possible outcomes = 8 = n(S) 

Probability of not drawing a yellow ball = 1 – Probability of drawing a yellow ball

Probability of not drawing a yellow ball = `1 - 1/8`

= `(8 - 1)/8`

= `7/8`