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Number of Digits in a Square Number

What will be ...

Question

What will be the unit digit of the square of 297?

A

3

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B

6

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C

9

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D

7

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Solution

The correct option is C 9
If the unit digit of a number is 7, then the unit digit of the square of that number is 9.

Hence, the unit digit of the square of 297 is 9.

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