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Question

A bag contains 3 red balls, 5 black balls and 4 white balls. A ball is drawn at random from the bag. What is the probability of not getting a black ball?


A
14
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B
512
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C
13
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D
712
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Solution

The correct option is D 712
Probability = Number of favourable outcomesTotal number of outcomes

Number of balls = 3+5+4 = 12

Number of balls that are not black = Number of red balls + Number of white balls.

= 3 + 4 = 7

P (not getting black ball) = 712.

Alternative Method:

No. of black balls = 5

P(black balls) = 512

P (not getting black ball) = 1512=12512=712

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