A 4 digit number of the form aabb is a perfect square What is the value of a b ........

Quant (SSC) Number System

A 4-digit number of the form aabb is a perfect square. What is the value of a - b?

A number of the form aabb has to be a multiple of 11.
So, it is the square of either 11 or 22 or 33 or...so on up to 99.
88² = 7744.

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