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Verified answer
9per 1-1/39÷2/3
27/2 = 13,5
keknya gitu
Bab Barisan dan Deret Bilangan
r = U2/U1
r = 3/9
r = 1/3
S~ = a/(1 - r)
S~ = 9/(3/3 - 1/3)
S~ = 9/(2/3)
S~ = 9 . 3/2
S~ = 27/2
S~ = 13 1/2