Question

Find the sum of natural numbers between 1 and 140 which are divisible by 4

Solution:- The numbers between 1 and 140 that are divisible by 4 are

4,8,12,…136.

Here, a=4, d=4, tn=

tn=a+ (n-1)d

136= + (n-1) × 4

⸫ n=

Sn=n/2

S34= 2380​

Answer 1

Answer:

The numbers between 1 and 140 that are divisible by 4 are

4,8,12,…136.

Here, a=4, d=4,

n = 34

Sum = 2380