The sum of first 20 even natural numbers is

The sum of first n even natural numbers is k times the sum of first n odd natural numbers then k= …….

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:

If the sum of first n even natural numbers is 420, find the value of ndot

If the sum of first "n" even natural numbers is 420, find the value of n.

If the sum of first n even natural numbers is 420, find the value of n.

The sum of the first 20 even natural numbers is

The sum of first 20 odd natural numbers is equal to :

If the sum of first n even natural number is 240. find the value of n.

If the sum of first n even natural number is 240. find the value of n.