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r=12/18=⅔
S∞=a/(1-r)
S∞=18/(1-⅔)
S∞=18/(⅓)
S∞=18×3
S∞=54
cara cepat
S∞=18×(3/(3-2))=18 × 3/1=54
Jadi 18+12+8+16/3+…=54