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Which of the following matrice is invert...

Which of the following matrice is invertible?
`[[1,0,1],[2,-2,1],[3,2,4]]`

Text Solution

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Let A=`[[1,0,1],[2,-2,1],[3,2,4]]`
`therefore absA=[[1,0,1],[2,-2,1],[3,2,4]]`
=`1[[-2,1],[2,4]]+1[[2,-2],[3,2]]`
=-8-2+4+6=0
`therefore` This matrix A is not invertible.
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