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15 December, 06:41

What is the sum of the geometric series 20 + 21 + 22 + 23 + 24 + ... + 29?

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  1. 15 December, 08:28
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    When you add 20 and 29, you get 49. When you add 21 and 28, you get 49. You will realize that there's 5 pairs that result in a sum of 49. 5*49=245.
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