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