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construct a 2xx3 "matrix" A=[a(ij)], who...

construct a `2xx3 "matrix" A=[a_(ij)]`, whose elements are give by `a_(ij)= {{:(i-j"," igej),(i+j"," ilt j):}`

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Since, `a_(ij)= {{:(i-j"," gej),(i+j"," lt j):}` "therefore" `a_(11)=1-1=0,a_(12) =1+2=3,a_(13)=1+3=4,`
`a_(21)=2-1=1,a_(22)=2-2=0 and a_(23)=2+3=5`
Hence, The required matrix is `A = [{:(0,3,4),(1,0,5):}]`
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