Question

8. Sum to n terms the following series :
(i) 1 x 2 + 2 x 3 + 3 x 4 + 4 x 5 + ...​

Answer 1

Answer:

40

Step-by-step explanation:

1 x 2 + 2 x 3 + 3 x 4 + 4 x 5 = 2+6+12+20 = 40

Answer 2

Answer:

2+6+12+20

=40(ans)

Hope it would be helpful