18
56
62
80
Correct answer is C
Un = n(n2 + 1) U5 = 5(2 + 1) = 5(25 + 1) = 5(26) = 130 U4 = 4(42 + 1) = 4(16 + 1) = 4(17) = 68 U5 - U4 = 130 - 68 = 62
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