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Question

Construct a 2×2 matrix A=[aij], whose element aij is aij=|2i3j|2.

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Solution

aij=|2i3j|2
aij i=,j= aij=|2i3j|2
a11 i=1,j=1 a11=|2(1)3(1)|2=|1|2=12
a12 i=1,j=2 a12=|2(1)3(2)|2=|4|2=42=2
a21 i=2,j=1 a21=|2(2)3(1)|2=|1|2=12
a22 i=2,j=2 a22=|2(2)3(2)|2=|2|2=22=1
Required matrix A=[a11a12a21a22]=⎢ ⎢122121⎥ ⎥

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