Question

Find 1+ 2+ 3+ 4+ ... +50, the sum of the first 50 natural numbers.
The sum is

Answer 1

Explanation:

First term(a) = 1

Common difference(d)=2-1=1

No.of term(n)=50

Sn=n÷2(n+1)=50÷2(50+1)=1275