Question

find the sum of all natural numbers between 100 and 300 that are divisible by 7​

Answer 1

hai mate

the sum of all natural numbers between 100 and 300 that are divisible by 7

=5586

Answer 2

a=105

d=7

an=294

an = a + (n-1)d

294= 105 + (n-1)7

294-105 = (n-1)7

189/7= n-1

27 =n-1

n = 28.

Sn = n/2 (a+an)

= 28/2 (105+294)

= 14 ( 399 )

= 5586.