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Identifying Perfect Square Numbers by Observing Their Last Digit

Square of 89 ...

Question

Square of 89 by Sutra Ekadhikena Purvena is?

A

4288

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B

2166

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C

7921

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D

3356

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Solution

The correct option is C 7921
(89)²
= (89 + 1) (89 – 1) + 1²
= 90× 88 + 1
= 7920 + 1
= 7921

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