Q4 of 805 Page 1

How many two digits numbers are divisible by 3?

1st two-digit number which is divisible by 3 is 12.

2nd two-digit number which is divisible by 3 is 15.


3rd two-digit number which is divisible by 3 is 18.


Last two-digit number which is divisible by 3 is 99.


12, 15, 18, ……, 99 ⇒ AP


an = a + (n – 1) d


99 = 12 + (n – 1)3


n = 30


So, there are 30 two-digit numbers which are divisible by 3


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