Question

If A is a perfect square and has the digit 1 at its units place, then find the digit at the units place of A√.

Answer 1

...... The unit place of square of a number is same as the unit place of the square of the unit place of the original number. For example, Take a number 11. Here unit place of the number is 1. Its square is 1. Therefore, 1 must be present at the unit place of square of 11. Square of 11 is 121.

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