a) Explain why a sequence an is well defined if it is defined recursively by specifying a1 and a2 and a rule for finding an from a1, a2..., an-1 for n = 3, 4, 5,…

b) Find the value of a„ if a1 = 1, a2 = 2, and an = an-1 + an-2 +........ +a1 for n = 3, 4, 5,....

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