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If Aa n dB are two non-singular matrices...

If `Aa n dB` are two non-singular matrices of the same order such that `B^r=I ,` for some positive integer `r >1,t h e nA^(-1)B^(r-1)A=A^(-1)B^(-1)A=` `I` b. `2I` c. `O` d. -I

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