Question

How many numbers between 400 to 700 both exclusive are divisible by 9 or 11?

Answer 1

lcm of 9 and 11=99
first number which is dividable by 99 and last number is
first=495
last=693
total number=693-495=198/99=2+1=3

Answer 2

Lcm of 9 and 11 = 99 first number which is dividable by 99 and last number is first = 495 last = 693 aggregate number = 693 – 495 = 198/99 = 2 + 1 = 3.

So there is 10 + 14 = 24, so 24 numbers detachable by either, however this likewise incorporates each number which is distinguishable by both 7 and 10 twice.