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If A=[a(i j)] is a 3xx3 diagonal matrix ...

If `A=[a_(i j)]` is a `3xx3` diagonal matrix such that `a_(11)=1` , `a_(22)=2` and `a_(33)=3` , then find `|A|` .

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Since A is a diagonal matrix, therefore, all it’s non-diagonal members are 0.
Thus`A=[[1,0,0],[0,2,0],[0,0,3]]`
`|A|=abs([1,0,0],[0,2,0],[0,0,3])`
=`|A|=6`
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