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प्रश्न
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
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उत्तर
The square of the following numbers will have 1 at their units place as (1)2 = 1, (9)2 = 81
81 and 139 i.e., (i) and (iii)
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