Let A = [a_ ij ]_ 2 2 , where a_ ij 0 for all i, j and A^2 = I. Let a be the sum of all diagonal elements of...

Question

Let A = [a_ ij ]_ 2 2 , where a_ ij 0 for all i, j and A^2 = I. Let a be the sum of all diagonal elements of A and b = |A|. Then 3a^2+4b^2 is equal to-

Accepted Answer

(A)

JEE Main 2023 Mathematics question

Solution