In how many can a collection of 30 ...

In how many can a collection of 30 books be divided into two groups of 10 and 20 so that the first group always contains a particular book ?

A

`""^(29)C_(29)`

B

`""^(29)C_(20)`

C

`""^(29) C_(10)`

D

`""^(29)C_(9)xx""^(29)C_(20)`

Text Solution

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The correct Answer is:

B

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