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U36=-5+35*3
U36=-5+105
U36=100
a = (-5)
Jumlah 36 suku:
Sn = n/2 (a + suku ke-n)
S36 = 36/2 {a + (a + (35)(3))}
S36 = 18 (-10 + 105)
S36 = 18 (95)
S36 = 1710