9. K=(+1) + (-2) + (+3) + (-4) + .. t (+19) + (-20) L= (+2) + (-3) + (+4) + (-5) +.. + (+20) + (-21) Yukarıda verilenlere göre K+L işleminin sonucu kaçtır? A) -22 B) -21 C) -20 D) -19 nedir bu
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