If `A ,B ,A+I ,A+B` are idempotent matrices, then `A B` is equal to

If A and B are not disjoint sets then n(A cup B) is equal to

If B is an idempotent matrix, and A=I-B , then

If A and B are n-rowed unitary matrices,then AB and BA are also unitary matrices.

If A, B and C are invertible matrices of some order, then which one of the following is not true?

If A, B and C are non empty sets, then (A-B) cup (B-A) equals

If A and B are symmetric matrices of same order than AB-BA is a:

If A and B are symmetric matrices, prove that AB-BA is a skew symmetric matrix.

If a,b,c are in G.P then (a-b)/(b-c) is equal to ………….

If A and B are matrices of the same order, then A B^T-B A^T is a/an (a) skew-symmetric matrix (b) null matrix (c) unit matrix (d) symmetric matrix