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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.
Solution
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`
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