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= 6+ (n-1)3
= 6+3n-3
= 3n+3
U1 = 3.1+3 = 6
U2 = 3.2+3 = 9
U3 = 3.3+3 = 12
U4 = 3.4+3 = 15
b. Un = 10+(n-1) (-2)
= 10-2n+2
= 12-2n
U1 = 12-2.1 = 10
U2 = 12-2.2 = 8
U3 = 12-2.3 = 6
U4 = 12-2.4 = 4