If \( 5 x^{2}+\lambda y^{2}=20 \) represents a rectangular hyperbol...

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If \( 5 x^{2}+\lambda y^{2}=20 \) represents a rectangular hyperbola,
\( \mathrm{P} \) then \( \lambda \) is equal to

W
(1) 5
(2) -5
(3) 4
(4) -4
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