The matrix \[\left( \begin{matrix} 1 & a & 2 \\ 1 & 2 & 5 \\ 2 & 1 & 1 \\ \end{matrix} \right)\]is not invertible, if ?a? has the value [MP PET 1998]

The matrix \[\left( \begin{matrix} 1 & a & 2 \\ 1 & 2 & 5�

1.	The matrix \[\left( \begin{matrix} 1 & a & 2 \\ 1 & 2 & 5 \\ 2 & 1 & 1 \\ \end{matrix} \right)\]is not invertible, if ?a? has the value [MP PET 1998]
A.	2
B.	1
C.	0
D.	-1
Answer» C. 0

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The matrix \[\left( \begin{matrix} 1 & a & 2 \\ 1 & 2 & 5 \\ 2 & 1 & 1 \\ \end{matrix} \right)\]is not invertible, if ?a? has the value [MP PET 1998]

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