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Dit : jumlah 6 suku pertama (S6)..?
jwb :
r = U2/U1
= a.r / a : 10/2
= r : 5
sehingga rasio = 5 , r > 1
S6 = a.( - 1 ) / r - 1
= 2.( - 1) / 5 - 1
= 2. (15.625-1) / 4
= 2. (15.624) / 4
= 7.812
smoga membantu