![]() To find the sum of first n odd numbers we can use the formula S n= n 2. The formula for the sum of the first n odd numbers is given as S n= n 2 where n represents the number of odd numbers. What is the Formula for the Sum of the First n Odd Numbers? To calculate the sum of odd numbers between 1 to 20 we will use S n= n 2 where n = 10 as there are 10 odd numbers between 1 to 20. The sum of odd numbers can be calculated using the formula S n= n/2 × where 'a' is the first odd number, 'l' is the last odd number and 'n' is the number of odd numbers or S n= n 2. Another formula to calculate the sum of odd numbers is S n= n 2. ![]() The formula for finding the sum of odd numbers is S n= n/2 × where 'a' is the first odd number, 'l' is the last odd number and 'n' is the number of odd numbers present in that range. We know that the series of odd numbers are always in AP as the common difference between them is 2. What is the Formula for Sum of Odd Numbers? For example, to calculate the sum of odd numbers between 1 to 10 we will consider all the odd numbers in this range and add them. The sum of odd numbers is defined as the addition or summation of all the odd numbers present in a given range. Related ArticlesĬheck these articles related to the concept of the sum of odd numbers.įAQs on Sum of Odd Numbers What is the Sum of Odd Numbers? Thus, the sum of odd numbers 1 to 50 is equal to 625. We know that the sum of odd numbers 1 to 50 is represented as S n = 1 + 3 +. We can alternatively show this using the formula S n = n/2 ×. Thus, by using the sum of n odd numbers formula which is n 2, we get, S 25 = 25 2 = 625. We know that there are 25 odd numbers between 1 to 50. Let's take an example to understand this.Įxample: Find the sum of odd numbers 1 to 50. Therefore, we have proved that the sum of first n odd numbers is equal to n 2. īy substituting the values of 'a' and 'l' in the above formula we get, The sum of n terms of an AP is given by the formula S n= n/2 ×. Thus, the first term (a) = 1, last term (l) = 2n - 1 and common difference (d) = 2. Here 1 represents the first odd number and (2n - 1) represents the last odd number. Let the sum of first n odd numbers be represented as S n = 1 + 3 + 5 +.+ (2n - 1). We know that the series of odd numbers is given as 1, 3, 5.(2n - 1) which forms an arithmetic progression with a common difference of 2. Let us now derive the sum of n odd natural numbers formula.
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