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Mathematics for IGCSE & O level - Sequences (Section 2 - No. 3)
The nth term of a sequence is given by \(U_n = n^2 + 2n\). What is the value of \(U_3\)?
12
15
21
24
Explication
Substitute n=3 into the formula: U_3 = (3)^2 + 2*3 = 15
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