So substituting our value for En in 3. So we can write a general term, the k-th term: Summing the first n natural numbers by finding a general term Here we unravel the right-hand side and hope to find a formula. We can try another approach, and look for the sum of the squares of the first n natural numbers, hoping that this sum will vanish.

Sometimes such approaches work only in specific cases.

The sum of the coefficients of the sum of the powers of the natural numbers is always 1. As expected, the cubic terms cancel, and we rearrange the formula to have the sum of the squares on the left: Sum of Natural Numbers Squared Using Errors When we did this with the natural numberswe found there was little work to do.

A pattern becomes clear. And for the sum to n Which gives us the sum of the first n natural numbers: We note the difference between the sum of the first n natural numbers, and the sum to n-1 is n The idea is that we look at the terms Sn-Sn-2, et c, and write down the know differences, hoping that a pattern appears and we can write Sn-k, and then to write down the n-th term, from which we can extract a formula.

As before, we set up as follows: While the error on each term for the sum of the numbers is constant, the error on the squares depends on the term. If we take En to be the error on the approximation to n terms: With the squares, we have to go a little further.

Which comes as no surprise! Using Infinite Calculus to find the Sum of the first n Natural Numbers This approach is similar to the previous one, but introduces a different approach that can be used with other natural number sums. As we cannot figure out the error this easily every time, we try another approach: The area of the triangular graph, if we take it as representing n numbers is: The sum of the n-1 squares and the error En-1, gives us: We note the relationship: The area under the graph approximates the sum of the natural numbers, so: Dividing throughout by 3 gives us the formula for the sum of the squares: Fortunately, this approach does work for any sum of the powers of the natural numbers.

Expanding the cube and summing the sums: Sum of the squares of the first n natural numbers using summation We tried this with the sum of the natural numbers using summationand fell flat on our faces, so this time we will go straight into setting up for the sum of the cubes, in the hope we will find our formula for the squares.This program assumes that user always enters positive number.

If user enters negative number, Sum = 0 is displayed and program is terminated. This program can also be done using recursion. Check out this article for calculating sum of natural numbers using recursion. This C Program calculates the sum of first N natural numbers.

Here is source code of the C program to calculate the sum of first N natural numbers. There are several ways to solve this problem.

One way is to view the sum as the sum of the first \(2n\) integers minus the sum of the first \(n\) even integers. Sums of the First n Natural Numbers The sum of the first n natural numbers, S n, is: See also and look for the sum of the squares of the first n natural numbers, hoping that this sum will vanish.

and write down the know differences, hoping that a pattern appears and we can write S n-k, and then to write down the n-th term, from which we. To compute the sum of natural numbers from 1 to n (entered by the user), loops can be used.

You will learn how to use for loop and while loop to solve this problem. To understand this example, you should have the knowledge of following C programming topics.

Write a c program to find the sum of square of first n natural number? Update Cancel. Answer Wiki. 12 Answers. first of all to to find sum of square of first n natural numbers we need three variables: How do I write a program to find the sum of squares of elements on the diagonal of a square matrix n × n?

DownloadWrite a program to compute the sum of squares of n natural numbers

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