Maths Problems, Numeracy and Mathematics Problem for the Weekend (8) – Neighbours February 1, 2013 User deactivated Use each of the numbers 1 to 6 once. Write one in each circle. Numbers next to each other must not be joined. For example, 3 must not be joined to 2 or 4. How many different solutions can you find? 1 2 3 4 5 6