Deret aritmetika
[tex]b eda= \frac{17 - 5}{8 - 2} = \frac{12}{6} = 2 \\ \\ a = u2 - b = 5 - 2 = 3 \\ \\ sn = \frac{n}{2} (2a + (n - 1)b) \\ \\ s20 = \frac{20}{2} (2(3) + (20 - 1)2) \\ \\ s20 = 10(6 + 38) \\ \\ s20 = 10(44) \\ \\ s20 = 440[/tex]
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Deret aritmetika
[tex]b eda= \frac{17 - 5}{8 - 2} = \frac{12}{6} = 2 \\ \\ a = u2 - b = 5 - 2 = 3 \\ \\ sn = \frac{n}{2} (2a + (n - 1)b) \\ \\ s20 = \frac{20}{2} (2(3) + (20 - 1)2) \\ \\ s20 = 10(6 + 38) \\ \\ s20 = 10(44) \\ \\ s20 = 440[/tex]