Question

Observe the following pattern
1
1
{1x (1+1)]
2
1
1+2
-{2 (2+1)]
2
1+2+3
{3 x(3+1)}
2
1+2+3+4
1 14 x(4+1)
and find the values of each of the following:
(i) 1+2+3+4+5+ ... + 50
(ii) 31 +32 + ... +50​

Answer 1

The values of each of the following:

1)1275 is the sum of all number.

2) 810 is the sum of all number.