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Number of all 3xx3 matrices formed by {1...

Number of all `3xx3` matrices formed by `{1,-1,0}` such that `"Trace"(A A^T)=6` is

A

`"^9C_3 . 2^6`

B

`"^8C_3 . 2^7`

C

`"^9C_4 . 2^9`

D

`3^9`

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