Diketahui barisan arıtmatika 5,8, 13, 20, Tentukan jumlah 35 Suku pertama Barisan tersebut.
Jawaban:
Diketahui:
a=5
b=8-5=3
n=35
Ditanya: S35?
Penjelasan dengan langkah-langkah:
[tex]s35 = \frac{35}{2} (2(5) + (35 - 1) \times (3)) \\ = \frac{35}{2} (10 + 34(3)) \\ = \frac{35}{2} (10 + 102) \\ = \frac{35}{2} (112) \\ = 1960[/tex]
Jadi, jumlah 35 suku pertamanya adalah 1.960
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