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ge0=a , a+b , a+2b+2
r = 2
(a+b)/a = 2
a+b = 2a
a = b
maka..geo= a , 2a , 3a+2
(2a)² = a(3a+2)
4a² = 3a² +2a
a²= 2a
a = 2
barisannya
arit = 2 , 4 , 6
geo= 2,4, 8 --> r = 2