Question 75679
Can you please help me put 
1-2+3-4+5-... 
in summation notation form
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Separate the odd numbers and the even numbers.
The odds are "summation"(2n+1) with n starting at zero
The evens are "summation"(2n) with n starting at 1
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Then the series is [odd summation]-[even summation]
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Cheers,
Stan H.