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a. Un = U1 + (n-1) b
U12 = 16 + (12 - 1) 8
= 16 + 11 x 8
= 88 + 16
= 104
b.Un = U1 + (n-1) b
U60 = -5 + (60 - 1) 4
= -5 + 59 x 4
= -5 + 236
= 231