1.

Sum to n terms of 1.2 + 2.3 + 3.4 + …………….. isA) \(\cfrac{n(n-1)(n+2)}3\)B) \(\cfrac{n(n+1)(n+2)}3\)C) \(\cfrac{n(n+1)(n+2)}2\)D) \(\cfrac{n(n-1)(n+2)}6\)

Answer»

Correct option is B) \(\cfrac{n(n+1)(n+2)}3\)



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