Apabila diketahui barisan aritmetika -18, -15, -12, -9, ... . Tentukan suku e-20 dari barisan tersebut.
bantu jawab
bantu jawab
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Jawaban:
39
Penjelasan dengan langkah-langkah:
-18, -15, -12, -9, (tiap angka polanya ditambah 3)
a = -18
b = +3
Un = a + (n-1) b
U20 = -18 + (20-1) 3
U20 = -18 + (19) 3
U20 = -18 + 57
U20 = 39