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ASIA TEAM Problems/Problem 1

Revision as of 05:42, 16 February 2024 by Abbywong (talk | contribs)
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Notice that the orders of $2n-1$ and $2n$ have opposite parities, as the order of $2n-1$ is one more than the order of $2n$, and the answer is $\frac{1000}{2}=\boxed{500}$.

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