Question

Find the sum of all integers between 100 and 550, which are not divisible by 9.

Answer 1

✨here is your answer ✨

we have to find the sum of all integers which are divisible by 9 between 100 and 550.

so, a = 108
d = 9
an = 549

we know that - an = a+(n-1)d
= 549= 108+(n-1)9
=. n = 50
so, Sn = n/2(a+an)
= 50/2(108+549)
= 3249 ANS..

✌️hope it helps u ✌️