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What is the quickest way to add the first 25 odd numbers?

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Anonymous

∙ 12y ago
Updated: 8/20/2019

Use the formula for an arithmetic series. That is, take the average of the first and the last number in the series, and multiply by 25. The first number in the series of course is 1; the last number is 1 + 2(24), since there are 24 intervals.

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∙ 12y ago
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