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a = 1, r = 4/1 = 4
2) 5, 10, 20, 40
a = 5, r = 10/5 = 2
3) 9, 27, 81, 243(bukannya 273 ya?)
a = 9, r = 27/9 = 3
4) 1/25, 1/5, 1, 5
a = 1/25, r = 5/1 = 5
5) 81, 27, 9, 3
a = 81, r = 3/9 = 1/3 = 3⁻¹