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Question

n persons are to sit in a row at random. The probability that two particular persons are together

A
3n
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B
2n
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C
1n
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D
4n
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Solution

The correct option is B 2n
n persons are to sit in a row at random.
Take 2 person take as one group, then for
two particular persons are together the ways is = 2! (n-1)!
Total ways for n person
are to sit in a row at random = n!
The probability that two particular persons are together =2!(n1)!n!=2n

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