Question

Find the sum of the first hundred even natural numbers divisible by 7 .​

Answer 1

Answer:

Even natural numbers: 2,4,6,8,10,....

Even natural numbers divisible by 5→10,20,30,40,.... to 100 terms

Here, a=10,d=20−10=10, and n=100

We have,

Solution =n/2(2a+(n−1)d)

=100/2[2×10+(100−1)10]

=50500.