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Construct a 3xx4 matrix A=[a(i j)] whose...

Construct a `3xx4` matrix `A=[a_(i j)]` whose elements are given by (i)`a_(i j)=i+j` (ii) `a_(i j)=i-j`

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`A=[[a_(11), a_(12), a_(13), a_(14)], [a_(21), a_(22), a_(23), a_(24)], [a_(31), a_(32), a_(33), a_(34)]]`
(i)`A=[[2, 3, 4, 5], [3, 4, 5, 6], [4, 5, 6, 7]]`

(ii)`A=[[0, -1, -2, -3], [1, 0, -1, -2], [2, 1, 0, -1]]`
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