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Q.

 In how many ways can 21 English and 19 Hindi books be placed in a row so that no two Hindi books are together?

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a

1504

b

1450

c

1540

d

1405

answer is A.

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Detailed Solution

∙E∙E∙E∙……∙E∙

According to condition there are 22 vacant places for

 Hindi books hence total number of ways are 

=22C19=1540 {Since books are same}

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