6. Jika bilangan 4, x, y, 142, r membentuk
barisan aritmetika, nilai r = . . . .
barisan aritmetika, nilai r = . . . .
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Barisan aritmetika
[tex] beda = \frac{142 - 4}{4 - 1} = \frac{138}{3} = 46 \\ \\ r = u5 = u4 + b = 142 + 46 \\Nilai \: r = 188[/tex]