Teaching AWES Army Public School TGT Mock Test 2024 Mathematics Binomial Theorem Binomial Expansion

If n ≥ 2 is a positive integer, then the sum of the series n+1C2 + 2(2C2 + 3C2 + 4C2 + …. + nC2) is

1
n(n + 1)2 (n + 2)/12
2
n(n – 1)(2n + 1)/6
3
n(n + 1)(2n + 1)/6
4
n(2n + 1)(3n + 1)/6
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