Probability - Arithmetic Aptitude Questions and Answers

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Discussion :: Probability

10 books are placed at random in a shelf. The probability that a pair of books will always be together is -.

1/10

9/10

1/5

3/10

1/2

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Answer : Option C

Explanation :

10 books can be rearranged in 10! ways consider the two books taken as a pair then number of favourable ways of getting these two books together is 9! 2!