Question

Using Suitable identity, evaluate the following:


${999}^{2}$


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Answer 1

Answer:

Answer. ∴ 25 numbers lie in between.

Answer 2

Answer:

Ans - (1000 - 1 )²

= 1000² + 1 × 1000 × 1 + 1²

= 1000000 + 1000 + 1

= 1001001

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