Mathematics
Squares of which of the following numbers will have 1 (one) at their unit's place ?
(i) 57
(ii) 81
(iii) 139
(iv) 73
(v) 64
Sq & Sq Roots
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Answer
According to the property of square number, if a number has 1 or 9 in its unit's place, then square of this number always has 1 at its unit place.
Hence, (ii) 81 and (iii) 139 will have 1 at their unit's place.
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