Question

How many two digit numbers are divisible by $4$?

Answer 1

The series as follows,

$12,16,..........,96$

$a=12,d=4,t_n=96$

$t_n=a+(n-1)d$

$96=12+(n-1)4$

$84=(n-1)4$

$21=n-1$

$\therefore n=22$

The total number of two digit numbers that are divisible by 4 are 22.