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Mathematics for IGCSE & O level - Sequences (Section 1 - No. 24)
Consider the sequence with the general formula \(U_n = n^2 + 3n - 1\). Find \(U_4\).
15
20
27
31
Paliwanag
Substitute n = 4: \(4^2 + 3*4 - 1 = 16 + 12 - 1 = 27\)
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