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 n natural numbers is 325. find n.

The sum of natural numbers from 1 to 100 is

Find the sum of natural numbers from 51 to 100.

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

Sum up the series (2)/(3) + (5)/(9) + (8)/(27)+(11)/(81) + ..... to n terms and hence find the sum to infinity . Sum up to infinity given that x lt numerically .