MATRICES AND DETERMINANTS | ONE SHOT SUPER REVISION | JEE MAINS AND ADVANCED | Q6

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MATRICES AND DETERMINANTS | ONE SHOT SUPER REVISION | JEE MAINS AND ADVANCED
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matrices and determinants Q6. A is a matrix such that aij = 0, i=j and 1, i not equal to j. Find inverse of A.

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[atharvkapila]

Another method of proving bkk as constant is by using the property of an identity matrix.where cii = 0 and cij =1 . we write cij=sum (aikbkj)=0 and cii as sum (aikbki) = 1.After some calculations, we realise that sum (bki) is constant and equal to 1/n-1 and from the eqns we also have bkk= sum(bki)-1 giving us bkk= 2-n/n-1

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