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WBJEE 2023 Math Solved Paper

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Question : 72

Total: 75

Let f be a strictly decreasing function defined on R such that f(x)>0,∀x∈R. Let ‌

=1 be an ellipse with major axis along the y-axis. The value of 'a' can lie in the interval (s)

(−∞,−6)
(−6,2)
(2,∞)
(−∞,∞)

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