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a = U1 = 3
b = U2 - U1 = 8 - 3 = 5
Un = a + (n - 1)b
= 3 + (n - 1)5
= 3 + 5n - 5
Un = 5n - 2
Un = 3+(n-1)5
Un = 3+5n-5
Un = 5n-2