Asked by Anonymous

{-1, -2, -3, 4, -5, -6, -7, 8, …}
How many positive even digits are in the first 16 terms of the pattern?
Answered by oobleck
well, look at the evens: -2, +4, -6, +8 ...
how many evens in the 1st 16 terms?
take 1/2 of that number
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