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= 1 + (2-1)4
= 1 + 4 = 5
u5 = 1 + (5-1)4 = 1+16 =17
u7 = 1 + (7-1)4= 25
b) u2 = 8
u5 = 29
u7 = 43
c) u2 = 4
u5 = 13
u7 = 19