Question: If six persons sit in a row, then the probability that three particular persons are always together is -.\nOptions:\n(A) 1/5\n(B) 1/7\n(C) 1/9\n(D) 1/2\n(E) 2/7 Random thoughts:
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3!4! Required probability = 3!4!/6! = 1/5 The final answer: (A).
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