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If A is matrix of order 3 xx 2 and B is ...

If A is matrix of order `3 xx 2` and B is matrix of order `2 xx 3`, then what is |kAB|equal to (where k is any scalar quantity)?

A

`k|AB|`

B

`k^(2)|AB|`

C

`k^(3)|AB|`

D

|AB|

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The correct Answer is:
To solve the problem, we need to find the determinant of the product of two matrices \( kAB \), where \( A \) is a \( 3 \times 2 \) matrix and \( B \) is a \( 2 \times 3 \) matrix. ### Step-by-Step Solution: 1. **Identify the dimensions of matrices A and B**: - Matrix \( A \) has dimensions \( 3 \times 2 \). - Matrix \( B \) has dimensions \( 2 \times 3 \). 2. **Determine the dimensions of the product AB**: - The product \( AB \) is defined since the number of columns in \( A \) (which is 2) matches the number of rows in \( B \) (which is also 2). - The resulting matrix \( AB \) will have dimensions equal to the number of rows of \( A \) and the number of columns of \( B \), which gives us a \( 3 \times 3 \) matrix. 3. **Calculate the determinant of kAB**: - According to the properties of determinants, if \( k \) is a scalar and \( C \) is a square matrix of order \( n \), then: \[ |kC| = k^n |C| \] - Here, since \( AB \) is a \( 3 \times 3 \) matrix, \( n = 3 \). - Therefore, we can write: \[ |kAB| = k^3 |AB| \] 4. **Conclusion**: - The determinant of \( kAB \) is given by: \[ |kAB| = k^3 |AB| \] ### Final Answer: \[ |kAB| = k^3 |AB| \]

To solve the problem, we need to find the determinant of the product of two matrices \( kAB \), where \( A \) is a \( 3 \times 2 \) matrix and \( B \) is a \( 2 \times 3 \) matrix. ### Step-by-Step Solution: 1. **Identify the dimensions of matrices A and B**: - Matrix \( A \) has dimensions \( 3 \times 2 \). - Matrix \( B \) has dimensions \( 2 \times 3 \). ...
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