A. resp...

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