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Question

Construct a 3×3 matrix whose elements aij are given by aij=0 if i<j and aij=i+j if ij.

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Solution

The elements of a 3×3 matrix are: A=a11a12a13a21a22a23a31a32a33

Applying the given rule: aij=0 if i<j and aij=i+j if ij.
a11=2,a12=0,a13=0a21=3,a22=4,a23=0a31=4,a32=5,a33=6

A=200346456 is the required matrix


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