Sum of all odd natural numbers in range L and R
Given two integers L and R, the task is to find the sum of all odd natural numbers in range L and R inclusive. Examples:… Read More »
Tag Archives: series-sum
Sum of all natural numbers in range L to R
Given a range L and R, the task is to find the sum of all natural numbers in range L to R. Examples: Input: L… Read More »
Sum of the elements from index L to R in an array when arr[i] = i * (-1)^i
Given two integers and and an array arr[] every element of which at index is calculated as arr[i] = i * (-1)i. The task is… Read More »
Sum of multiples of A and B less than N
Given a number N, the task is to find the sum of all the multiples of A and B below N. Examples: Input:N = 11,… Read More »
Program to find the sum of the series (1/a + 2/a^2 + 3/a^3 + … + n/a^n)
Given two integers and . The task is to find the sum of the series 1/a + 2/a2 + 3/a3 + … + n/an. Examples:… Read More »
Find the sum of all multiples of 2 and 5 below N
Given a number N. The task is to find the sum of all multiples of 2 and 5 below N ( N may be up… Read More »
Sum of first N natural numbers which are divisible by 2 and 7
Given a number N. The task is to find the sum of all those numbers from 1 to N that are divisible by 2 or… Read More »
Find sum of N-th group of Natural Numbers
Given a series of natural numbers divided into groups as: (1, 2), (3, 4, 5, 6), (7, 8, 9, 10, 11, 12), (13, 14, 15,… Read More »
Find the sum of series 3, -6, 12, -24 . . . upto N terms
Given an integer N. The task is to find the sum upto N terms of the given series: 3, -6, 12, -24, … upto N… Read More »
Find the sum of first N terms of the series 2×3 + 4×4 + 6×5 + 8×6 + …
Given an integer N. The task is to find the sum upto N terms of the given series: 2×3 + 4×4 + 6×5 + 8×6… Read More »
Sum of first N terms of Quadratic Sequence 3 + 7 + 13 + …
Given a quadratic series as given below, the task is to find sum of first n terms of this series. Sn = 3 + 7… Read More »
Program to find sum of 1 + x/2! + x^2/3! +…+x^n/(n+1)!
Given a number x and n, the task is to find the sum of the below series of x till n terms: Recommended: Please try… Read More »
Find Sum of Series 1^2 – 2^2 + 3^2 – 4^2 ….. upto n terms
Given a number n, the task is to find the sum of the below series upto n terms: 12 – 22 + 32 – 42… Read More »
Sum of Fibonacci Numbers with alternate negatives
Given a positive integer n, the task is to find the value of F1 – F2 + F3 -……….+ (-1)n+1Fn where Fi denotes i-th Fibonacci… Read More »
Find the unit place digit of sum of N factorials
Given a number N, the task is to find units place digit of the first N natural numbers factorials, i.e. 1!+2!+3!+….N! where N<=10e18. Examples: Input:… Read More »