If ^C0,^C1,^C2 ,^C n are the binomial co...

If `^C0,^C1,^C2 ,^C n` are the binomial coefficient, then `2xxC_1+2^3xxC^3+2^5xxC_5+` equals `(3^n+(-1)^n)/2` b. `(3^n-(-1)^n)/2` c. `(3^n+1)/2` d. `(3^n-1)/2`

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