Q.

If matrix A=[aij]3x3 , matrix B=[bij]3x3 , where aij+aji=0  and   bij−bji=0   ∀i,j,  then A4.B3  is

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a

Singular

b

zero matrix

c

Symmetric

d

Skew-symmetric matrix

answer is A.

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Detailed Solution

Here aij+aji=0⇒AT=−A & bij−bji=0⇒BT=B  and A, B are 3×3  matrices. Hence |A|=0⇒|A4B3|=0⇒A4B3  is singular matrix.
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If matrix A=[aij]3x3 , matrix B=[bij]3x3 , where aij+aji=0  and   bij−bji=0   ∀i,j,  then A4.B3  is