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un = 3n-1
u1 = 3(1)-1 = 3-1 = 2
u2 = 3(2)-1 = 6-1 = 5
u3 = 3(3)-1 = 9-1 = 8
jawab: C
2.
u1 = -3
u2 = -8
u3 = -13
b = u2-u1 = u3-u2
= -8-(-3) = -13-(-8)
= -8+3 = -13+8
= -5 = -5
b = -5
jawab: D