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U2 = 30
r = U2/a = 30/90 = 1/3
S∞ = a/(1 - r)
S∞ = 90/(1 - 1/3)
S∞ = 90/(2/3)
S∞ = 90 . 3/2 = 45 . 3 = 135
maka jumlah deret geometri tak hingga tersebut yaitu 135