Q9 of 74 Page 9

Find the indicated terms in each of the sequences. whose nth terms are an = (-1)n – 1n3, a9


an = (-1)n – 1. n3
for n = 9, a9 = (-1)9 – 1. (9)3
                      = 9 × 9 × 9 = 729
Hence an = 729

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