Show that the sum of first n even numbers is equal to `(1+1/n)` times the sum of first n odd numbers.

If the sum of first n even natural numbers is equal to k times the sum of first n odd natural numbers, then k is equal to:

The sum of the first n odd number is :

Find the sum of first n natural numbers.

The sum of first 30 natural numbers is:

Statement 1 The difference between the sum of the first 100 even natural numbers and the sum of the first 100 odd natural numbers is 100. Statement 2 The difference between the sum opf the first n even natural numbers and sum of the first n odd natural numbers is n.

Sum of first 10 odd numbers is ________

The arithmetic mean of first n odd natural numbers is :

If the sum of first n terms of an A.P. is cn^(2) then the sum of squares of these n terms is

Find the sum of first hundred even natural numbers divisible by 5.

If the sum of first 7 terms of an AP is 49 and that of 17, terms is 289, find the sum of first n terms.