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compute 900-841+784-729+...+36-25+16-9+4-1

 Sep 14, 2020
 #1
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If I understand your sequence, then this is the "closed form" of the sequence:

a_n = 63 - 4 n

Sum = (59, 55, 51, 47, 43, 39, 35, 31, 27, 23, 19, 15, 11, 7, 3) = 465

 Sep 14, 2020

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