**A CHALLENGE**

This is not a trick question; the sequence is based on a genuine mathematical rule. A word of warning though, although it does not require any complex mathematical knowledge the solution is pretty obscure.

Click HERE for the solution.

**A CHALLENGE**

This is not a trick question; the sequence is based on a genuine mathematical rule. A word of warning though, although it does not require any complex mathematical knowledge the solution is pretty obscure.

Click HERE for the solution.