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OpenStudy (anonymous):
find the sum of the odd intgers between -39 and 51 including them,that is , -39+(-37)+(-35)+....+49+51. also what is the correct formula to use
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OpenStudy (phi):
I don't know the formula, but it seems that -39 will cancel +39, -37 will cancel +37 and so on. That leaves the sum of the odd numbers 41, 43, ... 51
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