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What Is The Sum Of 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37 And 39?

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400
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Since the numbers are in a series (namely odd numbers below 40), a quick solution is
(1 + 39) x 20 / 2 = 400

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