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If A ,B ,A+I ,A+B are idempotent matrice...

If `A ,B ,A+I ,A+B` are idempotent matrices, then `A B` is equal to a.`B A` b. `-B A` c. `I` d. `O`

A

AB=BA

B

AB+BA=O

C

AB-BA=l

D

AB+BA=l

Text Solution

Verified by Experts

The correct Answer is:
B
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