Question

*. 1.2 +2.3 + 3,4 + ........... + n
.......... + n (n + 1)
n(n+1) (n+2)

در​

Answer 1

Answer:

for your help. Add your answer and earn points. ... that is, 1.2 + 2.3 +.... .k(k+1) = 1/3 * k * (k+1) * (k+2) We shall prove the result to be true for n = k+1. that is, to prove 1.2 ...