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U5 = 4(5) + 1
U5 = 20 + 1
U5 = 21
n= 11
U11 = 4(11) + 1
U11 = 44 + 1
U11 = 45
2. n= 5
U5 = 3(5-1)
U5 = 3(4)
U5 = 12
n= 11
U11 = 3(11-1)
U11 = 3(10)
U11 = 30