let A={a(ij)}(3xx3) such that a(ij)={3 ,...

let `A={a_(ij)}_(3xx3)` such that `a_(ij)={3 , i=j and 0,i!=j}`. then `{det(adj(adjA))/5}` equals: (where {.} represents fractional part)

A

`(1)/(5)`

B

`(2)/(7)`

C

`(3)/(7)`

D

`(4)/(7)`

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