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a =4
b = 7- 4
= 3
Un = a + (n-1)b
= 4 + (n - 1)3
= 4 + 3n - 3
= 1 + 3n atau 3n + 1
maka diperoleh rumus
Un = 3n + 1
b=3
Un=a+(n-1)b
= 4+(n-1)3
= 3n+1