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

10 books are placed at random in a shelf. The probability that a pair

1.	10 books are placed at random in a shelf. The probability that a pair of books will always be together is -
A.	$\frac{{1}}{{10}}$$
B.	$\frac{{9}}{{10}}$$
C.	$\frac{{1}}{{5}}$$
D.	$\frac{{3}}{{10}}$$
Answer» D. $\frac{{3}}{{10}}$$

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

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