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Mathematics for IGCSE & O level - Sequences (Section 2 - No. 9)

What is the difference between the 5th and 3rd terms in the sequence defined by \(a_n = 2n^2 - 1\)?
16
24
32
40

解释

5th term = 2(5)^2-1 = 49; 3rd term = 2(3)^2-1=17, therefore 49-17=32

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