Q. 84.2( 114 Votes )

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag.

What is the probability that the ball drawn is

(i) Red? (ii) Not red?

Answer :

(i) Total number of balls in the bag = 8
No of red balls = 3

Let E be the event of getting a red ball, then
No of favorable outcomes =  No of red balls = 3
No of possible outcomes = No of total balls = 8

Probability of the ball drawn to be red. :



(ii) We know that:

P (E) = 1 - P ()

where E and  are complementary events, as getting a red ball and not getting a red ball are complementary events


Probability of not getting red ball

= 1 - Probability of getting a red ball

= 1 -


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