If a singular matrix A=[a_{i j}]_{2 × 2} always commute with B=[\table 1 , 1 ; 2 , 1] such that \;{a_{11}}/{a_{12}}=√{k}, then k is equal to _________

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JEE Advanced 2020 Full Test 7 Paper 2

Question : 51

Total: 54

1	1
2	1

=√k, then k is equal to _________

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a11	a12
a21	a22

a11	a12
a21	a22