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Seven persons are to be seated in a row. The probability that two particular persons sit next to each other is

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Seven persons are to be seated in a row. The probability that two particular persons sit next to each other is A. 1 3 B. 1 6 C. 2 7 D. 1 2 Select the correct answer from above options

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Correct Answer - C (c) If two persons sit next to each other, then consider these two person as 1 group. Now, we have to arrange 6 persons. ∴ Number of arrangement=2!×6! Total number of arrangement of 7 persons=7! Required probability = 2!6! 7! = 2 7

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