Question : Three integers are chosen at random from the set of first 20 natural numbers. The chance that their product is a multiple of 3 is
(A) 194/285
(B) 1/57
(C) 13/19
(D) 3/4
Answer : option (A)
Solution :
Three integers are chosen at random from the set of first 20 natural numbers. The chance that their product is a multiple of 3 is
with
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