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Question Id : 15624 | Context : JEE Main 2019 (10 January Evening Shift)
Let $S = \{(x, y) \in \mathbb{R}^2 : \dfrac{y^2}{1 + r} - \dfrac{x^2}{1 - r} = 1 ; \, r \neq \pm 1 \}$. Then $S$ represents :


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