Question

A bag contains 10 red balls and 7 blue balls. A ball is drawn at random. The probability that ball drawn is not red is

Answer 1

total no. of balls = 10+7=17
Total possible outcomes = 17


p(E) = possible outcomes/Total outcomes

P(E) = Event of selecting blue ball/total no. of balls

P(E) = 7/17

Therefore, probability of not getting red ball means getting a blue ball.

Hence probability of not getting red ball= 7/17

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Answer 2

total number of balls =10+7
=17



the probability of getting red balls =10/17

the probability of not getting red balls =1-10/17

=17-10/17=7/17