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2+4+6+...+100 = 2550
2500-2550 = -50
= (1-2) + (3-4) + (5-6) + .... + (99-100)
= -1 - 1 - 1 - 1 - 1 ... - 1 (sebanyak 50 suku)
= -1 * 50
= - 50