1.

10 Books Are Placed At Random In A Shelf. The Probability That A Pair Of Books Will Always Be Together Is -?

Answer»

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! 2REQUIRED probability = 1/5.

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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