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suku awal (a) = 5
beda antar suku (b) = 4
maka
Un = a+(n-1)b
Un = 5 +(n-1)4
Un = 5 + 4(n-1)
Un = 5 + 4n - 4
Un = 5 -4 + 4n
Un = 1 + 4n