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a = 11 , 13 , 15 , 17
b = 13 - 11 = 2
un = a + ( n - 1 ) b
un = 11 + ( n - 1 )2
un = 11 + 2n - 2
un = 2n + 9
u₅ = 2.5 + 9 = 19
u₆ = 2.6 + 9 = 21
u₇ = 2.7 + 9 = 23