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a. Un = 3n – 1 à U1 = 3.1 – 1 = 3 – 1 = 2 U2 = 3.2 – 1 = 6 – 1 = 5 U3 = 3.3 – 1 = 9 – 1 = 8 U4 = 3.4 – 1 = 12 – 1 = 11 U5 = 3.5 – 1 = 15 – 1 = 14 b.Ux = 3x – 1 = 194 3x = 194 + 1 x = 195 / 3 = 65