Question

How many three-digit number are divisble by 9?

100 three digit number divisble by 9​

Answer 1

The three digits numbers which are divisible by 9 are 108,117,126,…,999

Then, first term a =108 Common difference =9

Last term =999 We know that, l=a

n

=a+(n−1)d

999=108+(n−1)9

999−108=9n−9

891+9=9n

900=9n

n=900/9

n=100