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Verified answer
Mapel : MatematikaKelas : IX SMP
Bab : Barisan dan deret
Pembahasan :
Un = a + (n - 1)b
115 = 10 + (n - 1)7
115 - 10 = 7n - 7
105 = 7n - 7
7n = 112
n = 16
Banyak suku = 16