Find the odd number pair: 1 : 0, 3 : 8, 6 : 35, 7 : 50.

7 : 50 is the odd pair.

1 : 0, 3 : 8 and 6 : 35 follow n : n^2 - 1 (1^2-1 = 0, 3^2-1 = 8, 6^2-1 = 35).

In each the second number is the first squared minus 1.

7^2 - 1 = 48, but the pair shows 50, not 48.

So the pair that breaks n : n^2 - 1 stands apart.