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Recursive definitions

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Give a recursive definition of
a) the sequence {an}, n=1,2,3,...if
i. an = 1+(-1)n
ii. an = n2
b) of the set of ordered pairs of positive integers S = {(a,b) | a є Z+, b є Z+, and 3 |(a+b)}.


Solution Summary

This solution is comprised of a detailed explanation to give a recursive definition.