Barisan aritmetika
[tex]b = \frac{215 - 209}{5 - 3} = \frac{6}{2} = 3 \\ \\ u3 = a + 2b \\ 209 = a + 2(3) \\ 209 = a + 6 \\ 209 - 6 = a \\ a = 203 \: (A)[/tex]
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Barisan aritmetika
[tex]b = \frac{215 - 209}{5 - 3} = \frac{6}{2} = 3 \\ \\ u3 = a + 2b \\ 209 = a + 2(3) \\ 209 = a + 6 \\ 209 - 6 = a \\ a = 203 \: (A)[/tex]