MBA Exam

How many ordered pair are there such that (a+b) is a perfect square ?(a,b)is an ordered pair such that a, b are two two digit numbers. when a interchange it's digit becomes b?Question: How many ordered pair are there such that (a-b) is a perfect square except zero ?

1) 3
3
2) 10
10
3) 13
4) none of these

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