Question

find the number of natural numbers between 101 and 999 which are divisible by both 2 and 5

Answer 1

89 would be the correct answer

Answer 2

the natural numbers between 101 and 999which are divisible by both 2 and 5 are
110,120,130,.......990it is in arithmetic progression
a=110 and d=10
nth term 990
so there are 89 numbers