Matrices_IV

If A and B are square matrices of same order, then AB ' - BA ' is a

• Skew symmetric

• Symmetric

• Null Matrix

• Unit Matrix

If A and B are symmetric matrices of same order, then AB - BA is a

• symmetric Matrix

• Skew- Symmetric Matrix

• Zero Matrix

• Identity Matrix

• A

• A - I

• A + I

• 3A

If A and B are square matrices of same order, then (A+B) (A-B) =

The Matrix A is

• Scalar Matrix

• Diagonal Matrix

• Square Matrix

• none of these

The Matrix A is a

• Scalar Matrix

• Symmetric Matrix

• Skew-Symmetric Matrix

• none of these

If A and B are defines as

• only AB is defined

• only BA is defined

• AB and BA are both defined

• AB and BA both are not defined

If A = A' then

• x = 5 and y = - 3

• x = - 3 y = 5

• x = y

• None of these

• 3I

• - 5 I

• 5 I

• None of these

Find AB + XY

• [28]

• [24]

• 28

• 24