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Question

Find the numbers whose square will end with digit 1.

A
(49)2,(19)2
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B
(18)2,(48)2
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C
(15)2,(25)2
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D
(24)2,(42)2
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Solution

The correct option is A (49)2,(19)2

The numbers which will have 1 at their unit place in their squares are the numbers ends with 1 or 9

Because 1×1 = 1 and 9×9=81

Hence, Option A is correct answer.

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