Question

a number cannot be a perfect square if it has 2 at unit place​

Answer 1

Property 1: A number having 2, 3, 7 or 8 at unit's place is never a perfect square. In other words, no square number ends in 2, 3, 7 or 8. Property 2: The number of zeros at the end of a perfect square is always even. In other words, a number ending in an odd number of zeros is never a perfect square.

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Answer 2

Yes....... it's true......