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Let Dk be the k times k matrix with 0's ...

Let `D_k` be the `k times k` matrix with 0's in the main diagonal, unity as the element of `1^ (st) ` row and `(f(k))^ (th) ` column and `k` for all other entries. If `f(x)=x-x` where `x` denotes the tional part function then the value of det. `(D_2)+` det.(D_3)` equals

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