What is the Sum of First 140 Positive Integers which are Divisible by 3?
How to Find the Sum of First 140 Positive Integers which are Divisible by 3?
The below workout with step by step calculation shows how to find what is the sum of first 140 positive integers which are divisible by 3 by applying arithmetic progression. It's one of the easiest methods to quickly find the sum of given number series.
step 1 Input Parameters and values:
The number series 3, 6, 9, 12, 15, 18, 21, . . . . , 420.
The first term a = 3
The common difference d = 3
Total number of terms n = 140
step 2 apply the input parameter values in the AP formula
Sum = n/2 x (a + Tn)
= 140/2 x (3 + 420)
= (140 x 423)/ 2
= 59220/2
3 + 6 + 9 + 12 + 15 + 18 + 21 + . . . . + 420 = 29610
Therefore, 29610 is the sum of first 140 positive integers which are divisible by 3.