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

Probability 30/07/2020

A. 1/10
B. 9/10
C. 1/5
D. 3/10

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!

Required probability = 1/5

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