Question

Sum of 25 natural numbers divided by 7

Answer 1

Answer:

Step-by-step explanation:

Natural numbers divided by 7are

7,14,21and so on

They are in ap in which

a=7,d=7

We know Sn=n/2(2a+(n-1)d)

=25/2(2(7)+24(7))

25/2(14+144)

=25/2(158)

=25(79)

=1975

So sum of 25natural numbers divisible by 7 is 1975