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Which of the following is compact? Explain your reasoning. (a) S = (-1,1] (b) S = [-20, 2] U [6, 12], (c) S = [7,00),

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Which of the following is compact? Explain your reasoning. (a) S = (-1,1] (b) S = [-20, 2] U [6, 12], (c) S = [7,00), (d) S = (-oo, 1] U [2, 3] U [4, 6], (e) S =D. (Hint: the empty set is a subset of any other set.)

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