 Hello and welcome to this session. Let us understand the following problem today. Write minors and cofactors are the elements of the following determinant. We have the determinant with elements a, c, b, d. Now, before writing the solution, let us understand what are minors and cofactors. Minor of an element a, i, j of a determinant is the determinant obtained by deleting its i, throes and jth column in which element a, i, j lies minor of an element. a, i, j is denoted by m, i, j. Cofactor. Cofactor of an element is a, i, j is equal to minus i to the power i plus j m, i, j, where m, i, j is the minor. So, now let us write the solution. We have our determinant as a, c, b, d. Now, minor of the element a, a11 that is a is equal to m11 which is equal to d. Now, minor of the element a12 which is c is equal to m12 which is equal to b. Now, similarly, minor of the element a21 that is b is equal to m21 which is equal to c. Now, minor of the element a22 is equal to m22 which is equal to a. Now, similarly, we will find cofactors. So, cofactor of a11 is equal to a11 which is equal to minus 1 to the power 1 plus 1 m11 which is equal to d. Now, cofactor of a12 is equal to a12 which is equal to minus 1 to the power 1 plus 2 m12 which is equal to minus b. Now, cofactor of a21 is equal to a21 which is equal to minus 1 to the power 2 plus 1 m21 which is equal to minus c. Similarly, cofactor of a22 is equal to a22 which is equal to minus 1 to the power 2 plus 2 m22 which is equal to a. Hence, the required answer is m11 is equal to d, m12 is equal to b, m21 is equal to c, m22 is equal to a, a11 is equal to d, a12 is equal to minus b, a21 is equal to minus c, a22 is equal to a. This is our final and the required answer. I hope you understood the problem. Bye and have a nice day.