Which of the following will have 1 in the units place?

123²

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161²

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82²

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77²

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Solution

The correct option is B
161²

If the digit at the units place of a number is 1 or 9, then its square will always have 1 in its units place.

Thus, from the given options $161^{2}$ will have 1 in its units place.

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