JEE Main 2020
Matrices & Determinants
Matrices and Determinants
Hard
Question
If , then is equal to :
Options
Solution
This problem tests your understanding of properties of determinants, especially those related to scalar multiplication of matrices and adjugate matrices. We will systematically break down the problem using these properties.
1. Key Concepts and Formulas
For an matrix :
- Determinant of a scalar multiple: , where is a scalar.
- Determinant of the adjugate: .
- Determinant of the adjugate of adjugate: .
In this problem, the matrix