tentukan suku ke 8 dari barisan geometri 1/8, 1/27, 1/9, 1/3
TI
royani8
Pertanyaan
tentukan suku ke 8 dari barisan geometri 1/8, 1/27, 1/9, 1/3
1 Jawaban
-
1. Jawaban dendyrustandi
Barisan Geometri : 1/81, 1/27, 1/9, 1/3
a = 1/81
r = U2 / U1
r = (1/27) / (1/81)
r = 1/27 x 81
r = 81/27
r = 3
Un = ar^n-1
U8 = (1/81) (3)^8-1
U8 = (1/81) (3)^7
U8 = (1/81) (2187)
U8 = 2187/81
U8 = 27