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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.
Solution
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`
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