October 2018 1 10 Report
Tentukan hasil dari (tanpa menghitung satu persatu)

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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