resp = 0 + 1 – 2 + 3 – 4 + 5 – ... (+ ou –) n
resp = 0 + 1 – 22 + 34 – 46 + 5n
resp = 0 – 1 – 2 – 3 – 4 – 5 – ... – n
resp = 0 + 1! – 2! + 3! – 4! + 5! – n!
resp = 0 – 1 + 2 – 3 + 4 – 5 + ... – n
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