Problem | Solution | Printable page |

Consider all of the five-digit numbers which we can form using only the digits 2, 4, 6 and 8.
If these numbers are arranged in ascending order, what is the 512th number?

Divisibility. Comparing and Ordering numbers. Integers. Factors and multiples. Mathematical reasoning & proof. Combinations. Place value. Properties of numbers. Permutations. Number bases.