Find the value of ^{n+1}C_{2} + 2(^{2}C_{2} + ^{3}C_{2} + …… + ^{n}C_{2}) = ?

(1) $n(n+1)(2n-1)\over6$

(2) $n(n+1)(2n+1)\over6$

(3) $(n-1)n(n+1)\over6$

(4) $n(n+1)\over2$

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