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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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