What is the Sum of Natural Numbers from 20 to 80?
getcalc.com's Arithmetic Progression (AP) calculator, formula & workout to find what is the sum of numbers from 20 to 80.
3050 is a sum of number series by applying the values of input parameters in the formula.
How to find the Sum of Natural Numbers from 20 to 80?
The below workout with step by step calculation shows how to find what is the sum of natural numbers or positive integers from 20 to 80 by applying arithmetic progression. It's one of an easiest methods to quickly find the sum of given number series.
step 1 Input parameters and values:
The number series 20, 21, 22, 23, . . . . , 79, 80.
The first term a = 20
The common difference d = 1
Total Number of terms n = 61
step 2 apply the input parameter values in the formula
Sum = n/2 x (a + Tn)
= (61/2) x (20 + 80)
= (61 x 100 ) / 2
20 + 21 + 22 + 23 + . . . . + 79 + 80 = 3050
Therefore, 3050 is the sum of positive integers between 20 and 61.
