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The answer is 144, because 1+3 is 4 add 5=9 add 7=16 add 9=25+11= 36+13=49+15=64+17=81+19=100+21=121+23=144. And there you go

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12y ago
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Q: What is 1 plus 3 plus 5 plus 7 plus 9 plus 11 plus 13 plus 15 plus 17 plus 19 plus 21 plus 23 plus 25 plus 27 plus 29 plus 31 plus 33 plus 35 plus 37 plus 39?
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