Sum of natural numbers up to infinity.

What is the sum of even natural numbers up to the first 68 terms

Sum of two natural numbers is a rational number.

Sum of two natural numbers is a rational number.

Sum of two natural numbers is a rational number.

The sum of first n natural numbers is given 1/2 n^2 +1/2n . Find (i) The sum of first 5 natural numbers. (ii) The sum of first 11 natural numbers. (iii) The sum of natural numbers from 11 to 30.

The sum of natural numbers from 1 to 100 is

The sum of n natural numbers is 325. find n.

Find the sum of natural numbers from 51 to 100.

The sum of n natural numbers is 325 . Find n.

The sum of all natural numbers from 75 to 97 is: