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Whole Numbers

Evaluate 999 ...

Question

Evaluate {(999)2 – 1}.

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Solution

$\{{(999)}^{2} - 1\} = \{{(999)}^{2} - 1^{2}\} = (999 - 1) (999 + 1) = (998) (1000) = 998000$

Hence, {(999)² – 1} = 998000.

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