Jawabanmu

2014-06-02T18:59:33+07:00
Diket : n=8, a=8, un =176,96
un = ar^(n-1)
17496 = 8r^7
17496/8 = r^7
2187 = r^7
3 = r
sn = a(r^n -1)/r -1
= 8(3^8 - 1)/ 3-1
= 8(6560/2)
=26240 cm atau 262,4 meter