(1 - 0) , (3 - 8) , (6 - 35) , (7 - 50)
Option:
Justification: In all other pairs, the second number is one less than the square if the first number.

(1 - 0) , (3 - 8) , (6 - 35) , (7 - 50)
Justification: In all other pairs, the second number is one less than the square if the first number.