Question

How many 4 digit numbers can be formed using 0-5 and divisible by 4?

Answer 1

0123 1234 3425 0531 multiples of 4

Answer 2

since a number cannot start with 0 so, 1st place of of 4 digit number can be filled in 5 ways i.e., 1,2,3,4,5. 
second place of 4 digit number can be filled in 6 ways i.e., 0,1,2,3,4,5
since 4 digit numbers should be divisible by 4 so possibility of last 2 places are (04,12 20,24,32,40,52) i.e., 7 possibilities.
Therefore total number of 4 digut number divisible by 4 are- 5*6*7=210