10 books are placed at random in a shelf. The probability that a pair of books will always be together is -. A. 1/10 B. 9/10 C. 1/5 D. 1/10 Answer Workspace Report Discuss Answer with explanation 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! Required probability = 1/5 Workspace
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