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b = 4
U5 = a +(5-1)b
U5 = a + 4b
18 = a +(4 x 4)
18 = a + 16
a = 18-16
a = 2
Un = a +(n-1)b
Un = 2 +(n-1)4
Un = 2 + 4n - 4
Un = -2 + 4n
Un = 4n - 2 (B)
18 = a + 4(5-1)
18 = a + 4(4)
18 = a + 16
18 - 16 = a
2 = a
Un = a + b(n-1)
Un = 2 + 4(n-1)
Un = 2 + 4n - 4
Un = 4n - 2 ( B )