Q.

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

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a

45

b

15

c

25

d

210!

answer is B.

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Detailed Solution

n(A)=9!2!             P(A)=9!2!10!
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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