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80 = a / (1-r)
s ganjil = a/ (1- r²)
50 = a/ ( (1-r) (1+r)
50 = 80 x 1/(1+r)
50 (1+r) = 80
50 + 50r = 80
50r = 30
r = 3/5
80 = a/(1-3/5)
80 = a/ (2/5)
32 = a
Suku 1 = 32