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b = 9-5 = 4
maka,
Un = a+(n-1).b
Un = 5+(n-1).4
Un = 5+4n-4
Un = 4n+1 ... (b)
b= 4
Un= a+(n-1)b = 5 + (n-1) 4 = 5+4n-4 = 1+4n (b)