Question

Find the sum of first 25natural numbers divided by 7

Answer 1

s25=2275

Step-by-step explanation:

The A.P of first 25 natural numbers divisible by 7,

7,14,21,28,........175

Here,

First term (a) = 7

Common difference (d) =7

last term(l) = 175

Sn =n÷2 (a+l] -----{Formula}----

S25

=25÷2 [7+175]

= 25÷2[7+175]

= 25÷2×182

=25×91

= 2275

The sum of first 25 natural numbers divisible by 7 is 2275

Read more on Brainly.in - https://brainly.in/question/8535854#readmore