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By just examining the units digits, ca...

By just examining the units digits, can you tell which of the following cannot be whole squares? (I)1026                  (ii)    1028              (iii)   1024 (iv)1022                  (v)    1023               (vi)   1027

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We know that a perfect square cannot end with the digit `2`,`3`,`7`, or `8`.
Therefore, `1028`, `1022`, `1023` and `1027` cannot be a prefect square.
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