If A= [a_ i j ]_ 3 3 = [ array ccc 1 & 3 & 3 -1 & 2 & 2 1 & 1 & 4 array ] and A_ i j is a cofactor of a_ i j then the value of a₃₁ A₃₁+a₃₂ A₃₂+a₃₃ A₃₃ is equal to

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Quantrex Academy · Accepted Answer

Correct answer: B. 15

aligned & a₃₁ A₃₁+a₃₂ A₃₂+a₃₃ A₃₃=|A| & =1 (8-2)-3(-4-2)+3(-1-2)=6+18-9=15 aligned

If A= [a_ i j ]_ 3 3 = [ array ccc 1 & 3 & 3 -1 & 2 & 2 1 & 1 & 4 array ] and A_ i j is a cofactor of a_ i j then the value of a₃₁ A₃₁+a₃₂ A₃₂+a₃₃ A₃₃ is equal to

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