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u2 = 1, u3 = 3
b. u1 = 1^2-2 = -1
u2 = 2, u3= 7
c. u1 = 1/2(1^2+1) = 1
u2 = 5/2, u3 = 5
2). Un = 3n^2+4
u10 = 3(10)^2+4 = 304
Un= 1/2n^2+3
U12 = 1/2(12)^2+3 = 72+3 = 75