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If `A=[a_(i j)]` is a matrix given by `A=[a_(i j)]=[4 5 21\ \ -2 7 15\ \ 1 9 18\ \ 3 6-25]` write the order of `A` and find the elements `a_(24),\ a_(34)` . Also, show that `a_(32)=a_(23)+a_(24)` .

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Order of the matrix is `3 xx 4`
`a_(24)=6`\ and `a_(34)=-25`
`a_(32)=15` and `a_(23)+a_(24)=9+6=15`
Hence, `a_(32)=a_(23)+a_(24)`.
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