April 2019 1 21 Report
Tentukan hasil dari (tanpa menghitung satu per satu)

a. 2+4+6+8+10+...+100
b. -1+2-3+4-5+6-7+8-...+100
c. -100-99-98-...-2-1-0+1+2+...+97+98+99

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