What is the sum of all natural numbers from 1 to 100?

Natural numbers, which include all positive integers from to infinity, are a part of the number system. .

We already know that,

Sum of n natural numbers = n( n + 1 )/2

Sum from 1 to 100 = 100.101/2 = 5050

Hence, the correct option is (a) i.e. 5050.