construction of matrices :
a.2×2 matrix,in which aij=i+j
b.3×2 matrix in which aij=i+2j
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a) a11=1+1=2
a12=1+2=3
a21=2+1=3
a22=2+2=4
b) a11=1+2*1=1+2=3
a12=1+2*2=1+4=5
a21=2+2*1=2+2=4
a22=2+2*2=2+4=6
a31=3+2*1=3+2=5
a32=3+2*2=3+4=7
a12=1+2=3
a21=2+1=3
a22=2+2=4
b) a11=1+2*1=1+2=3
a12=1+2*2=1+4=5
a21=2+2*1=2+2=4
a22=2+2*2=2+4=6
a31=3+2*1=3+2=5
a32=3+2*2=3+4=7
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