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

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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 -

Options:

A . $$\frac{{1}}{{10}}$$

B . $$\frac{{9}}{{10}}$$

C . $$\frac{{1}}{{5}}$$

D . $$\frac{{3}}{{10}}$$

Answer: Option C

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