Question

If A is an idempotent matrix and A + B =I, then which of the
following is true?
a. B is idempotent
b. AB = 0
C. BA=0
d. all of these​

Answer 1

If A is an idempotent matrix and A + B =I, then which of the

following is true?

a. B is idempotent

b. AB = 0

C. BA=0

d. all of these