Warren Chadwick
04/28/2024 · Middle School
12. \( \left(a_{n}\right) \) aritmetik dizisinde \( a_{1}=1 \) ve ortak fark 4 ise bu dizinin ilk 20 terim toplamı kaçtır? \( \begin{array}{llll}\text { A) } 600 & \text { B) } 640 & \text { C) } 720 & \text { D) } 780\end{array} \)
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Dizinin ilk 20 terim toplamı 780'dir.
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