October 2018 2 121 Report
4) tentukan hasil dari (tanpa menghitung satu persatu)
a. 1+3+5+7+9+.....+99
b. 1-2+3-4+5-6+7-8+......-10
c. -100-99-98......-2-1-0+1+2+.....+48+49+50

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