Mathematics - Permutation & Combination Question with Solution | TestHub

When a number is divisible by $3$, then sum of digits of a number is also divisible by $3$.

Number can be formed from $(0,1,2,3)$ or $(0,2,3,4)$.

Number of $4$ digits number

$=3\times 3\times 2\times 1+3\times 3\times 2\times 1$

$=36$.