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A set of three numbers are chosen from the set S={1,2,3,…,(2n+1)}. If the probability that the numbers chosen are in arithmetic progression is 421, then the value of n is

Answer» A set of three numbers are chosen from the set S={1,2,3,,(2n+1)}. If the probability that the numbers chosen are in arithmetic progression is 421, then the value of n is


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