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What large cubes you have!

Algebra Level 2

$999^3 - 123^3 - 876^3$

is equal to:

999^2 + 123 ^2 + 876 ^ 2

999 \times 123 \times 876

999 + 123 + 876

3 \times 999 \times 123 \times 876

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by Chung Kevin

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