December 2018 2 21 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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