A bag contains 3 red balls and 8 blacks ball and another bag contains 5 red balls and 7 blacks balls...........

Quantitative Aptitude ( CCS) Probability

A bag contains 3 red balls and 8 blacks ball and another bag contains 5 red balls and 7 blacks balls, one ball is drawn at random from either of the bag, find the probability that the ball is red.

93/264

95/264

91/264

97/264

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Explanation:

Answer – 91/264
Explanation :
Probability = probability of selecting the bag and probability of selecting red ball
(1/2)*(3/11) + (1/2)*(5/12) = 91/264