Teaching JKPSC Lecturership Mock Test Series 2024-25 Mathematical Science Topology Connectedness and Compactness
Let X = {(x, y) ∈ \(\mathbb R^2\): x2 + y2 < 7} and K = {(x, y) ∈ \(\mathbb R^2\): 1 ≤ x2 + y2 < 3 or 4 ≤ x2 + y2 < 5} then the number of connected components of X\K is
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