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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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