Sum
A bag contains a black ball, a red ball and a green ball, all the balls are identical in shape and size. A ball is drawn from the bag without looking into it. What is the probability that the ball drawn is:
(i) a red ball
(ii) not a red ball
(iii) a white ball.
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Solution
Total number of possible outcomes = 3
∴ P(E) = `1/3`
(ii)
Not a red ball
Number of favourable outcomes
= Green ball + Black ball
= 1 + 1 + 2
∴ P(E) = `2/3`
(iii)
A white ball
Number of favourable outcomes = 0
∴ P(E) = `0/3 = 0`
Concept: Basic Ideas of Probability
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