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r=¼:½=¼×2=2/4=½
Sn = a(1-rⁿ)/(1-r)
S6 = ½(1-½^6)/(1-½)
S6 = ½(1-1/64) / ½
S6 = ½(63/64) × 2
S6 = 63/64
Jawaban A