Question

a bag contains 18 balls out of which x are red.If one ball is drawn at random from the bag,what is the probability that it is not red .If 2 more red balls are put in the bag,find the new probability

Answer 1

Probability of getting red balls = Total number of red balls/ total number of balls

Hence probability = x/18

If 2 more red balls are added then total red balls is X + 2
Total number of balls = 18 + 2 = 20

Hence new probability = x+2/20