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728= ar^5
-------- :
728/9= r4
81= r4
r = 3
maka 9 = ar
9 = 3a
a= 3
Jadi
S4= a + ar + ar^2 + ar^3 = 3 + 9 + 27 + 81 = 120
Suku1 3pangkat1 = 1
2. 3pangkat2 = 9
3. 3pangkat3 = 27
4. 3pangkat4 = 81
5. 3pngkat5 = 243
6. 3pangkat6= 729
Suku1+suku2+suku3+suku4
3+9+27+81 = 120