If A= [a_ i j ]_ 3 3 = [ array lll 3 & 2 & 4 1 & 4 & 1 2 & 6 & 3 array ] and A_ i j is a cofactor of a_ i j , then the value of a₂₁ A₂₁+a₂₂ A₂₂+a₂₃ A₂₃ is equal to

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Quantrex Academy · Accepted Answer

Correct answer: B. 8

a₂₁ A₂₁, a₂₂ A₂₂+a₂₃ A₂₃=|A|=3 (12-6)-2(3-2)+4(6-8)=8

If A= [a_ i j ]_ 3 3 = [ array lll 3 & 2 & 4 1 & 4 & 1 2 & 6 & 3 array ] and A_ i j is a cofactor of a_ i j , then the value of a₂₁ A₂₁+a₂₂ A₂₂+a₂₃ A₂₃ is equal to

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