Question
Let X = {(x, y)∈â„2: x2 + y2 = 1} ∪ ([-1, 1] * {0}) ∪ ({0} * [-1, 1]). Let n0 = max{k: k < ∞, there are k distinct points p1,..., pk ∈ X such that X∖{p1,..., pk}is connected}The value of n0 is ______
Answer: Option D
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