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u1 = 2.1+1 = 3
u2 = 2.2+1 = 5
u3 = 2.3+1 = 7
u4 = 2.4+1 = 9
u5 = 2.5+1 = 11
b . n²+1
u1 = 1²+1 = 2
u2 = 2²+1 = 5
u3 = 3²+1 = 10
u4 = 4²+1 = 17
u5 = 5²+1 = 26
c. n²+n
u1 = 1²+1 = 2
u2 = 2²+2 = 6
u3 = 3²+3 = 12
u4 = 4²+4 = 20
u5 = 5²+5 = 30
d. 5×2^n-1
u1 = 5 . 0 = 0
u2 = 5. 2 = 10
u3 = 5 . 4 = 20
u4 = 5 . 8 = 40
u5 = 5 . 16 = 80