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U12= 10+11.5
U12 = 10+55
U12 =65
b = 5
Un = a + (n - 1) b
U12 = 10 + (12-1) 5
= 10 + 11 x 5
= 10 + 55
U12 = 65
Jadi, u12 adalah 65. Maaf jikalau salah^^