What is the sum of successive odd natural numbers?
The sum S of n successive odd numbers starting from 3 is given by the relation : S = n (n + 2). Determine n, if the sum is 168.
Prove that: 1 + 2 + 3 + ......... + n = n(n+1)2 i.e., the sum of the first n natural numbers is n(n+1)2.
If the sum of first n even natural numbers is equal to k times the sum of the first n odd natural numbers, then k =