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Mata Pelajaran : MatematikaMateri : Barisan dan Deret
Diketahui :
Deret Geometri -1 + 2 - 4 + 8 - ...
Ditanyakan :
Jumlah 5 suku pertama
Jawab :
rasio =
a = -1
Sn =
S5 =
S5 =
S5 =
S5 = - 11
Jadi, jumlah 5 suku pertama adalah -11