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suku pertama/a = 3
Suku ke n/Un = ....
rumus = Un = a + (n-1) b
berarti Un = 3 + (n-1) 4
(n tinggal masukin suku ke berapa yang dicari
b=7-3=4
Un= a +(n-1)b
Un= 3+(n-1)4