Answer : 2 19/90 Explanation : Answer: B) 19/90 Explanation: ASSISTANT→AAINSSSTTSTATISTICS→ACIISSSTTTHere N and C are not common and same letters can be A, I, S, T. Therefore Probability of choosing A = 2C19C1×1C110C1 = 1/45 Probability of choosing I = 19C1×2C110C1 = 1/45Probability of choosing S = 3C19C1×3C110C1 = 1/10Probability of choosing T = 2C19C1×3C110C1 = 1/15Hence, Required probability = 145 145 110 115= 1990

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