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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 neither yellow nor red.
Solution
Total number of balls in the bag = 3 + 4 + 1 = 8
Number of possible outcomes = 8 = n(S)
Neither yellow ball nor red ball means a blue ball
Event of not drawing a yellow or red ball = E = 4
n(E) = 4
Probability of not drawing a yellow or red ball = `(n(E))/(n(S)) = 4/8 = 1/2`
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