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

The sum of n odd natural numbers is

The sum of n natural numbers is 5n^2+4n . Find the 8th term.

Sum of 1 to n natural numbers is 36 . Find the value of n .

(i) Find the sum of first n natural numbers. (ii) Find the sum of first 100 natural numbers.

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.

If the sum of n natural numbers is one sixth of their squares , then n is :

If the sum of n natural numbers is one sixth of their squares, then n is :

Sum of 1 to n natural numbers is 36, then find the value of n.

Statement - I : The variance of first n even natural numbers is (n^(2) - 1)/(4) Statement - II : The sum of first n natural numbers is (n(n+1))/(2) and the sum of the squares of first n natural numbers is (n(n+1)(2n+1))/(6)

Statement - I : The variance of first n even natural numbers is (n^(2) - 1)/(4) Statement - II : The sum of first n natural numbers is (n(n+1))/(2) and the sum of the squares of first n natural numbers is (n(n+1)(2n+1))/(6)