Number Theory
# Divisibility

Is 12345 divisible by 5?

**Note:** 12345 is divisible by 5 if it can be divided into groups of 5 with nothing left over.

**repunit**. How many digits long is the smallest repunit that is divisible by 9?

For how many different values of \(A\) is the three digit number \(3A6\) even?

Note: \(A\) can be any of the 10 digits from 0 to 9.

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