matrices and determinants

2. if A is a matrix of order 3x3, then number of minors in determinant of A are
4. If inverse of a square matrix exists, it is ___
6. if any two rows or any two columns are identical or proportional, then value of determinant is ___
7. a matrix which only has one row
9. the ___ is the transpose of matrix of the cofactors
11. a square matrix is called ___ matrix if all the non-diagonal elements are zero
14. a matrix equal to its transpose
15. ___ is what remains after removal of a row and column from a matrix
19. matrix addition is ___ i.e A=B and B=A
20. An m x n is a ___ matrix if m=n

1. a matrix whose determinant is zero
3. a matrix type whose inverse does not exists
5. the number of functions in a matrix are called
8. ordered rectangular array of numbers
10. two matrices can be added or subtracted only if they have the same order.
12. the ___ matrix has 1s on the diagonal and 0s off the diagonals
13. In which matrix, the determinant is equal to the product of its diagonal elements
16. if any two rows or columns of a determinant are interchanged, then ___ of determinant changes
17. Any square matrix can be represented as the sum of a ___ and a skew symmetric matrix
18. A square matrix has __ if and only if A is non-singular