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S∞=a/1-r
=12:1-(-2/3)
=12.3/5=7 1/5
a = 12
r = U2 / U1 --> r = -8/12 = -2/3
S tak hingga = a / (1 - r)
= 12 / (1 - (-2/3) )
= 12 / (3/3 + 2/3)
= 12 / (5/3)
= 12 x 3/5
= 36/5
= 7 1/5
semoga membantu ya :)