Diketahui barisan geometri 3, 9, 27, 81. tentukan suku ke-8!
Jawaban:
= 6.561
Penjelasan:
Rumus barisan geometri
Un = a.r^(n – 1)
maka:
3, 9, 27, 81, …
a = 3
R = U2/U1
R = 9/3
R = 3
Un = a×r^(n – 1)
U8 = 3×3^(8 – 1)
U8 = 3×3⁷
U8 = 3×2.187
U8 = 6.561
Diketahui barisan geometri 3, 9, 27, 81. tentukan suku ke-8!
Jawaban:
= 6.561
Penjelasan:
Rumus barisan geometri
Un = a.r^(n – 1)
maka:
3, 9, 27, 81, …
a = 3
R = U2/U1
R = 9/3
R = 3
Un = a×r^(n – 1)
U8 = 3×3^(8 – 1)
U8 = 3×3⁷
U8 = 3×2.187
U8 = 6.561