NDA2025MathematicsDeterminantsActual
Consider the following statements: Statement-I: If X is an n n matrix, then (mX) = m^n (X) , where m is a scalar. Statement-II: If Y is a matrix obtained from X by multiplying any row or column by a scalar m , then (Y) = m (X) . Which one of the following is correct in respect of the above statements?
Options
- ABoth Statement-I and Statement-II are correct and Statement-II explains Statement-I
- BBoth Statement-I and Statement-II are correct but Statement-II does not explain Statement-I
- CStatement-I is correct but Statement-II is not correct
- DStatement-I is not correct but Statement-II is correct
Correct answer
A. Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
Step-by-step solution
Statement-I states that for an n n matrix X , (mX) = m^n (X) . This is a standard property of determinants and is correct. Statement-II states that if a single row or column of a matrix is multiplied by a scalar m , the determinant of the resulting matrix is m times the determinant of the original matrix. This is also a fundamental property of determinants and is correct. Multiplying a matrix X by a scalar m is equivalent to multiplying each of its n rows by m . By applying the property given in Statement-II n time