If the sum of first n positive integers is equal to n(n+1)/2, then what is the sum of the first 25 positive integers?
Sum of first n positive integers = n*(n + 1)/2R.K wrote:If the sum of first n positive integers is equal to n(n+1)/2, then what is the sum of the first 25 positive integers?
Sum of first 25 positive integers = 25*(25 + 1)/2 = 25*26/2 = 25*13 = 325
