Question

2. Find the sum of integers which are divisible
by a from 11 to 5o.
​

Answer 1

here a = 11.

d=1.

an=50.

n=50-10=40.

S=N/2(A+an).

=40/2(11+50).

=50/2(61).

=25x61.

=1525. answer is 1525.