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The sum of the first n odd numbers is `n^2` .
We can easily validate this using the first few values of n.
When n=1, so they are the same.
When n=2, `1+3=4=2^2`
When n=3, `1+3+5=9=3^2`
So the sum of the first 5000 odd numbers is
The sum of the first 5000 odd numbers is 25,000,000.
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