Question

Suku ke-10 dari barisan geometri 1/4, 1/6, .......

Answer 1

A = 1/4
r = 1/6 : 1/4
r = 4/6
r = 2/3

u10 = ar⁹
u10 = 1/4(2/3)⁹
u10 = 1/2²(2⁹/3⁹)
u10 = 1(2⁷/3⁹)
u10 = 2⁷/3⁹
u10 = 128/19683

Answer 2

A
= 1/4
r
= 1/6 / 1/4
= 2/3

Un
= a × r^n-1
U10
= 1/4 × (2/3)^10-1
= 1/4 × (2/3)^9
= 1/4 × (512/19.683)
= 128/19.683