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Determine which of the following are functions from the set of real numbers, R, or a subset of R, to R. a. f(x) = 1

Determine which of the following are functions from the set of real numbers, R, or a subset of R, to R. a. f(x) = 1 if xE{1,2,3,4}, and f(x) = 4 if x {1,2,3,4} b. f(x) =0 for all xER and f(x) = 1 if xE{6, 7,8,9,..} c.

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