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a = 2/r
Sn = a / 1-r
32/3 = (2/r) / (1-r)
16/3 = 1 / ( r-r² )
16r - 16r² = 3
0 = 16r² - 16r +3 ⇒ difaktorkan lalu didapat r = 3/4 ∧ r = 1/4