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If A=[a(ij)](4xx4) such that a(ij)={(2; ...

If `A=[a_(ij)]_(4xx4)` such that `a_(ij)={(2; if i=j),(0; if i!=j))` then {`det(adj(adjA))/7`} is (where {.} represent fractional portion) (A) `1/7` (B) `2/7` (C) `3/7` (D) none of these

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