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Un= a+(n-1) b
73= -8+(n-1) 3..
73=-8+3n-3
84=3 n
n=28
Un = a + b(n-1)
73 = -8 + 3(n - 1)
81 = 3n -3
84 = 3n
n = 28
Banyak suku barisan tsb adalah 28