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Question
Which among 432, 672, 522, 592 would end with digit 1?
Options
432
672
522
592
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Solution
592
Explanation:
We know that, unit’s digit of the square of a natural number is the unit’s digit of the square of the digit at unit’s place of the given natural number.
∴ Unit's digit of 432 = 9 ...[∵ 32 = 9]
Unit's digit of 672 = 9 ...[∵ Unit’s digit of 72 is 9]
Unit's digit of 522 = 4 ...[∵ 22 = 4]
Unit's digit of 592 = 1 ...[∵ Unit’s digit of 92 is 1]
Clearly, the square of 592 end with digit 1.
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