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Permutation under Restriction

A library has...

Question

A library has two books each having three copies and three other books each having two copies. In how many ways can all these books be arranged in a shelf so that copies of the same book are not separated?

A

120

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B

360

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C

20

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D

60

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Solution

The correct option is A $120$
(Refer to Image)
$5_{1}^{1}$ ways= $120$ ways
In $120$ ways they can be arranged.

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