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Verified answer
A + 19b = 45a + 2b = 11
_________ _
17b = 34
b = 2
a + 2b = 11
a + 2(2) = 11
a = 7
Un = a + (n-1)b
Un = 7 + (n-1)2
Un = 7 + 2n - 2
Un = 2n +5