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a= 6(1-r1)...(1)
.
s~ sukuganjil = 4
a= a
r2 = r1²
a= 4( 1- r1²)...(2)
..
6 ( 1- r1) = 4( 1- r1²)
6(1-r1) = 4(1-r1)(1+r1)
6 = 4 ( 1 + r1)
r1 = 2/4 = 1/2
a = 6( 1- r1)
a= 6(1 - 1/2)
a = 6-3
a= 3
dert itu a, ar,ar² ....
3, 3/2, 3/4 .....