True or False
1. If a matrix has 4 rows and 5 columns then the number of elements in that matrix is 9. 2. A square matrix A= [aij] is called diagonal matrix if aij =0 for i = j. 3. Identity matrix is not a diagonal matrix. 4. If A= [aij] 2x3 and B= [bij] 3x4 then order of (AB) is 2x4 5. If all the entries in a matrix are multiplied by scalar k than whole matrix is multiplied by 3k. 6. In (AB) -1= A-1B-1 when A&B are matrices. 7. Inverse of every matrix exist. If a matrix has 4 rows and 5 columns then the number of elements in that matrix is 9? Identity matrix is not a diagonal matrix? If all the entries in a matrix are multiplied by scalar k than whole matrix is multiplied by 3k?
Inverse of every matrix exist? If two rows (columns) of a determinant are identical then value of the determinant is? Cofactor of an element aij is defined by? A matrix which has only ________ is called row vector? The matrix which has same number of rows and columns is called_________? If two rows or columns of a matrix are identical then |A| =_________?
If all the entries of a row or column of a square matrix are zero then |A| =_______? If a matrix is in triangular form, then the value of its determinant is the product of the entries in _________? The value of a determinant changes its _______ if any two rows are interchanged?