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a = 3
b = 1
Sn = 150
Maka,
Ambil positif,
n = 15
Sehingga,
n yang dimaksud di atas bukan solusi soal ini.
Sehingga,
n = a+(n-1)b
n = 3+(15-1)1
n = 3 + 14
n = 17