Question

List 5 numbers, so that
- the first number is 1,
- the average of the first two numbers is 2,
- the average of the first 3 numbers is 3,
- the average of the first 4 numbers is 4,
- and the average of all 5 numbers is 5?

Answer 1

1, 3, 5, 7, 9. You could continue on with this pattern forever by adding two to each previous number and it would average out correctly.