Question

Between 100 and 200 there are how many numbers which is divisible by 3

Answer 1

by the given data
AP:102,105,108,......,198
here a=102,d=3,an=198
an=a+(n-1)d
198=102+(n-1)3
198=102+3n-3
3n=198-99
3n=99
n=33
hence the number of numbers which are divisible by 3 =33