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...+3.....+5......+7....
........+2.....+ 2
deret tingkat dua
a = 6, b = 3 , c = 2
Un = a+ (n-1)b + 1/2 (n-1)(n-2) c
Un = 6 + (n-1)3 + 1/2(n-1)(n-2)(2)
Un = 6 + 3n - 3 +(n-1)(n-2)
Un = 3+3n + (n-1)(n-2)
U12 = 3 + 36 +(12-1)(12-2)
U12 = 39 + (11)(10)
U12 = 39 + 110
U12= 149