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Verified answer
Un = n/2 + n²U1 = 1/2 + 1² = 3/2
U2 = 2/2 + 2² = 10/2 = 5
U3 = 3/2 + 3² = 3/2 + 18/2 = 21/2
U4 = 4/2 + 4² = 2 + 16 = 18
jawab : C