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y = \frac{1}{\sqrt{4 - x}}

- \infty < x \leq 4; 0 \leq y < \infty

- \infty < x < 4; 0 < y < \infty

- \infty < x < 4; 0 \leq y < \infty

- \infty < x \leq 4; 0 < y < \infty

ANS : 2

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