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Sn= n/2 (2.8 + (n-1) 12)
Sn= n/2 (16+(n-1)12)
Sn= n/2 (16.12+(n-1))
Sn= n/2 (192+n-1)
Sn= 191/2
Sn= 95.5
maaf kalo salah ✌