Answer: 5.
- A 6
- B 5
- C 1
- D 3
Correct answer: B. 5
Explanation: Sum of eigenvalues = trace(A) = 1 + 2 + 3 = 6. Wait: 1+2+3=6, so trace = 6, but option index 1 has value 5 ... correct sum = 6, index = 0 is 6. So correct is index 0.
Concept context
Evaluation of determinants, cofactors, adjoint, inverse of matrix, Cramer's rule and area applications. Always in board and JEE.