1.

Prove that ""^(10)C_(2)+2xx^(10)C_(3)+^(10)C_(4)=^(12)C_(4)

Answer»

`2^(20) - 2^(5)`
`(20!)/(5!15!)`
`(20!)/(5!15!) -1`
`(20!)/(5!15!) - (15!)/(5!10!)`

Answer :D


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