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.....+3....+5.....+7.......+9.
.........+2.....+2.....+2...
a = - 2
b = 3
c = 2
deret tingkat dua
Un = a + (n-1)b + 1/2 (n-1)(n-2)c
Un= -2 +(n-1)3 + 1/2 (n-1)(n-2)(2)
Un = -2 + 3n -3 + n²-3n+2
Un = n² - 3
..