Q15 of 50 Page 6

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

(i), (ii), (iv), (v) and (vi) cannot be whole perfect squares.
This is because square numbers do not end in the digits 2,3,7 or 8.

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