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Mathematics, 04.05.2021 08:20 raytaygirl

Find the sum of the first 39 terms of the following series, to the nearest integer. 12 , 20 , 28 , . . . 12,20,28,...

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Find the sum of the first 39 terms of the following series, to the nearest integer. 12 , 20 , 28 , ....
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