SOLUTION: There are 10 rolls of filmin a box and 3 are defective. Two rolls will be selected, one after the other. What is the probability of selecting a defective roll followed by another
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Question 430856: There are 10 rolls of filmin a box and 3 are defective. Two rolls will be selected, one after the other. What is the probability of selecting a defective roll followed by another defective roll? Answer by sudhanshu_kmr(1152) (Show Source):
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probability that first roll is defective = 3/10
probability that second roll is defective = 2/9
required probability = 3/10 * 2/9
= 1/15
another method.....
probability = 3C2 / 10C2
= 3/ 45
= 1/15
