1.

The value of ""^(n)C_(3)+""^(n)C_(7)+""^(n)C_(11)+…. is :

Answer»

`1/2{2^(n-1)-2^(n//2)"SIN"(NPI)/(4)}`
`1/2{2^(n-1)+2^(n//2)"sin"(npi)/(4)}`
`1/2{2^(n+1)-2^(n//2)"sin"(npi)/(4)}`
None of these

Answer :A


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