A box contains 15bolts of which 5 are defective. If 5 bolts are selected at random from the box, what is the probability that at least one of them is defective? a) 91/143 b) 101/143 c) 111/143 d) 121/143 e) 131/143

A box contains 15bolts of which 5 are defective. If 5 bolts are selected at random from the box, what is the probability that at least one of them is defective?
a) 91/143
b) 101/143
c) 111/143
d) 121/143
e) 131/143
by

1 Answer

Answer :

Probability that at least one is defective = 1 – probability that none is defective
Probability that none is defective = 10C5 / 15C5 = 12/143
Required Probability = 1-12/143 = 131/143
Answer: e)
by

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