If `A=[{(,1,2,3),(,3,-2,1),(,4,2,1)}]` then show that `A^(3)-23A-40I=0` | Class 12 Maths | Doubtnut

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If `A=[{(,1,2,3),(,3,-2,1),(,4,2,1)}]` then show that `A^(3)-23A-40I=0`

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