Let \( y^{2}=4 a x \) be a parabola and \( x^{2}+y^{2}+2 b x=0 \) be a circle. If parabola and c...

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Let \( y^{2}=4 a x \) be a parabola and \( x^{2}+y^{2}+2 b x=0 \) be a circle. If parabola and circle touch each other
\( \mathrm{P} \) externally, then

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(a) \( a0, b0 \)
(b) \( a0, b0 \)
(c) \( a0, b0 \)
(d) \( a0, b0 \)
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