परवलयों \( y^{2}=4 a x \) व \( x^{2}=4 b y \) की उभयनिष्ठ स्पर्श रेखाओं की संख्या है (A) 4 (B) 2...

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परवलयों \( y^{2}=4 a x \) व \( x^{2}=4 b y \) की उभयनिष्ठ स्पर्श रेखाओं की संख्या है
(A) 4
(B) 2
(C) 3
(D) 1
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