1.

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

Answer»

Solution :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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