(121-196) , (144-225) , (36-83) , (16-49)
Option:
Justification: In 36-83, ?83 is not square number. Every other pair is square of a number.

(121-196) , (144-225) , (36-83) , (16-49)
Justification: In 36-83, ?83 is not square number. Every other pair is square of a number.