If \( a, b, c \) are in G.P., then the equation \( a x^{2}+2 b x+\m...

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If \( a, b, c \) are in G.P., then the equation \( a x^{2}+2 b x+\mathrm{c}=0 \) and \( d x^{2}+2 e x+f=0 \) have common root if \( \frac{d}{a}, \frac{e}{b}, \frac{f}{c} \) are in
P
(a) A.P.
(b) GP.
(c) H.P.
(d) \( a b=c d \)
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