Mathematics, 22.05.2021 18:40, derisepicowe0fa
What is the sum of the first 20 terms of the arithmetic sequence shown? \displaystyle \frac{1}{3} 3 1 , \displaystyle \frac{2}{3} 3 2 , 1, \displaystyle \frac{4}{3} 3 4 , \displaystyle \frac{5}{3} 3 5 , ...
Answers: 3
= First term = 
= Common difference = 
= Number of terms = 20![S=\dfrac{n}{2}[2a_1+(n-1)d]\\\Rightarrow S=\dfrac{20}{2}\times (2\times \dfrac{1}{3}+(20-1)\dfrac{1}{3})\\\Rightarrow S=70](/tpl/images/1341/8056/676a2.png)
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What is the sum of the first 20 terms of the arithmetic sequence shown? \displaystyle \frac{1}{3} 3...
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