Matrix 04-04-2024

If a matrix A is both symmetric and skew-symmetric then

• A is a diagonal matrix

• A is a square matrix

• A is a zero matrix

• None of these

Choose the correct answer

• Skew-symmetric Matrix

• Symmetric Matrix

• Zero Matrix

• Identity Matrix

If A is a 2 × 3 matrix, and B is a 3 × 4 matrix, how many columns does AB have?

• 2

• 3

• 4

• AB is not defined

• 2x3

• 3x2

• 3x4

• 4x3

What is a₂₃

• 14

• 4

• 1

• 3

Matrices can be multiplied only...

• if the row of the first matrix is equal to the column of the second matrix.

• if the column of the first matrix is equal to the column of the second matrix.

• if the column of the first matrix is equal to the row of the second matrix.

• if the row of the first matrix is equal to the row of the second matrix.

• unit matrix

• null matrix

• symmetric matrix

• skew symmetric matrix

Add

• 11    8
  -4     2
• 3     2
  -6    -6
• -3    2
  -4    -6
• 10    8
  -6    2

You can multiply a 2X3 matrix by which matrix?

• 2X2
• 2X12
• 3X12
• 2X3

Diagonal matrix is

• a matrix all the elements except the principal diagonal are zero

• If all the elements above the principal diagonal are zero

• square matrix all the elements except the principal diagonal are zero

• If all the elements below the principal diagonal are zero