Diketahui suatu barisan a=2 , dan beda (b) =4 tentukan suku ke 20 dari barisan tersebut!
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Barisan aritmetika
[tex]un = a + (n - 1)b \\ u20 = 2 + (20 - 1)4 \\ u20 = 2 + (19)4 \\ u20 = 2 + 76\\ u20 = 78[/tex]
Jawaban:
Dik: a = 2 dan b = 4
Dit: U20
Un = a + (n-1).b
U20 = 2 + (20-1).4
= 2 + 19.4
= 2 + 76 = 78