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Un=a+(n-1)b
136=4+(n-1)3
136=4+3n-3
136=3n+1
135=3n
135/3=n
n=45
Un = a+(n-1).b
136 = 4+(n-1).3
136 = 4+3n-3
136-4+3 = 3n
135 = 3n
n = 45
Jadi jawabannya yg (C)
Arigatou^^
Maaf klu salah..