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b : 1 / 512
c : 7, ............
b).
Un=arⁿ-¹
U12=4 (½)^11
U12=4 . 1/2048
U12=1/512
c).
Sn=a(1-rⁿ)/(1-r)
S12=4(1-(½)^12)/(1-(½))
S12=4(1-1/4096)/(½)
S12=4(4095/4096) × 2
S12=4095/512
S12=7 511/512
atau
S12=7,998