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a = 5
b = 7 - 5 = 2
Un = a + (n - 1)b
= 5 + 2(n - 1)
= 5 + 2n - 2
= 2n + 3
b = 2
Un = a + (n-1) b
= 5 + (n-1)2
= 5 + 2n -2
= 2n + 3