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a = 8
b = -2
U1 = 8
U2 = 8 - 2 = 6 ==> S2 = 8+6 = 14
U3 = 6 - 2 = 4 ==> S3 = 14 + 4 = 18
U4 = 4 - 2 = 2 ==> S4 = 18 + 2 = 20
U5 = 2 - 2 = 0 ==> S5 = 20 + 0 = 20
Jadi n adalah 4 atau 5