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U3 = 3(3)+2
= 9+2
= 11
a = 5
b = U2 - U1
b = 8 - 5
b = 3
U3 = a + (n-1)b
U3 = a + (n-1)3
U3 = a + (n*3) - (1*3)
U3 = a + 3n - 3
U3 = 5 + 3n - 3
U3 = 5 - 3 + 3n
U3 = 2 + 3n
U3 = 3n + 2 (A)