[Math] Give the digits $0, 1, 2, 3, 4$, and $5$. How many four digit numbers can be formed if digits can be repeated and contain at least one digit $3$

Question

Given the digits $0, 1, 2, 3, 4$, and $5$. How many four digit numbers can be formed if digits can be repeated and contain at least one digit $3$?

Answer 1

Hint: Count how many without the restriction and subtract the number with no $3$.