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Which of the following matrice is invert...

Which of the following matrice is invertible?
`[[2,1,-2],[1,2,1],[3,6,4]]`

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Let A=`[[2,1,-2],[1,2,1],[3,6,4]]`
`therefore absA =[[2,1,-2],[1,2,1],[3,6,4]]`
=`2[[2,1],[6,4]]-1[[1,1],[3,4]]-2[[1,2],[3,6]]`
=2(8-6)-(4-3)-2(6-6)
=4-1-0=`3 ne 0`
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