tentukan suku ke 8 barisan geometri 729, 243, 81, 27, ... dijawab secepatnyaa ya please

Barisan geometri 729, 243, 81, 27, ...
a = 729
r = 243 / 729 = 1/3
Un = a. r^(n-1)
 
U8 = 729. (1/3)^(8-1)
      = 729. (1/3)^7
      = 729. 1/2187
      = 1/3

a = 729
rasio = U2/U1 = 1/3

Un = a×r^n-1
U8 = 729 × 1/3^7
U8 = 729 × 1/2187
U8 = 729/2187
U8 = 1/3

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