What is the Sum of First 85 Natural Numbers?
getcalc.com's Arithmetic Progression (AP) calculator, formula & workout to find what is the sum of first 85 natural numbers.
3655 is a sum of number series from 1 to 85 by applying the values of input parameters in the formula.
How to Find Sum of First 85 Natural Numbers?
The below workout with step by step calculation shows how to find what is the sum of natural numbers or positive integers from 1 to 85 by applying arithmetic progression. It's one of an easiest methods to quickly find the sum of any given number series.
step 1 Input parameters and values:
The number series 1, 2, 3, 4, . . . . , 84, 85.
The first term a = 1
The common difference d = 1
Total number of terms n = 85
step 2 apply the input parameter values in the formula
Sum = n/2 x (a + Tn)
= 85/2 x (1 + 85)
= 7310/2
1 + 2 + 3 + 4 + . . . . + 84 + 85 = 3655
Therefore, 3655 is the sum of positive integers upto 85.
