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Patterns in Square Differences

What will be ...

Question

What will be the unit digit of the square of 27?

A

9

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B

7

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C

5

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D

1

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Solution

The correct option is A
9

Since 27 has 7 at its units place and the square of 7 is 49. Hence, the square of 27 will have 9 at its units place.

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