December 2018 1 49 Report
Tentukan hasil dari (tanpa menghitung satu per satu)
a. 1+3+5+7+9+...+99
b. 1-2+3-4+5-6+7-8+...-100
c. -100-99-98-...-2-1-0+1+2+...+48+49+50


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