If A is an 3xx3 non-singular matrix su...

If A is an `3xx3` non-singular matrix such that `A A^'=A^' A` and `B""=""A^(-1)A^'` , then BB' equals (1) `I""+""B` (2) `I` (3) `B^(-1)` (4) `(B^(-1))^'`

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