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a1 = a2 = 2, an = an – 1–1, n > 2. Find a5.(a) 2(b) -1(c) 1(d) 0I had been asked this question in an internship interview.I would like to ask this question from Sequences in chapter Sequences and Series of Mathematics – Class 11

Answer»

The correct answer is (b) -1

The EXPLANATION: an = an – 1–1, N > 2

=> a3 = a2 – 1 = 2 – 1 = 1

=> a4 = a3 – 1 = 1 – 1 = 0

=> a5 = a4 – 1 = 0 – 1 = -1.



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