Barisan aritmetika
[tex]un = a + (n - 1)b \\ u19 = 3 \sqrt{2} + (19 - 1)4 \sqrt{2} \\ u19 = 3 \sqrt{2} + (18)4 \sqrt{2} \\ u19 = 3 \sqrt{2} + 72 \sqrt{2} \\ u19 = 75 \sqrt{2} [/tex]
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Barisan aritmetika
[tex]un = a + (n - 1)b \\ u19 = 3 \sqrt{2} + (19 - 1)4 \sqrt{2} \\ u19 = 3 \sqrt{2} + (18)4 \sqrt{2} \\ u19 = 3 \sqrt{2} + 72 \sqrt{2} \\ u19 = 75 \sqrt{2} [/tex]