1.

The number of ways 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 is

Answer»

`""^(29)C_(29)`
`""^(29)C_(20)`
`""^(29)C_(10)`
`""^(29)C_(9)xx""^(29)C_(20)`

Answer :B


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