Q. Determinant $\left| \begin{matrix} 1/a & a^{2} & bc \\ 1/b & b^{2} & ca \\ 1/c & c^{2} & ab \end{matrix} \right|$ is equal to

A) $abc$
B) $\frac{1}{abc}$
C) $ab + bc + ca$
D) 0
Explanation

(d)
Given that, $\left| \begin{matrix}
\frac{1}{a} & a^{2} & bc \\
\frac{1}{b} & b^{2} & ca \\
\frac{1}{c} & c^{2} & ab
\end{matrix} \right| = \frac{1}{abc}\left| \begin{matrix}
1 & a^{3} & abc \\
1 & b^{3} & abc \\
1 & c^{3} & abc
\end{matrix} \right|$
$= \frac{abc}{abc}\left| \begin{matrix}
1 & a^{3} & 1 \\
1 & b^{3} & 1 \\
1 & c^{3} & 1
\end{matrix} \right|$
$= 0$
$(\because$ columns $C_{1}$ and $C_{3}$ are same)

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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