A bag contains 3 black, 4 white and 5 red balls. One ball is drawn at random. Find the probability that it is either black or red ball:

A bag contains 3 black, 4 white and 5 red balls. One ball is drawn at random. Find the probability that it is either black or red ball:

A 2/3

B 1/4

C 5/12

D 1/2

Solution

Correct Answer: Option A

P(black ball)=3/12

P(red ball)=5/12

P(black or red)=3/12+5/12=2/3