Abyss of Infinity

How much is 1-2+3-4+5-6+...?First answer: (1-2)+(3-4)+... = (-1)+(-1)+... = -∞Second answer: 1+(-2+3)+(-4+5)+... = 1+1+... = +∞Which answer is correct?HQ original: http://www.youtube.com/watch?v=g7x-tRBQ2gwContact me at: [email protected]: x_YAMABIKO_x

http://www.nicovideo.jp/watch/sm22476529