Question

how many 2 digit number are divisible by 3

Answer 1

There are 20 - 30 2-digit numbers which are divisible by 3.

Hope It Helps:)

Answer 2

Very simple

they will form an AP with :

first term, a = 12

nth term, an= 99

common difference = 3

now we need to find n and that will your answer

n=  an - a +d /d

=99-12+3 /3

=90/3

=30

there are thirty such numbers

NOTE ---- the above formula is nothing but a changed form of basic formula