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Let Dk, is the k xx k matrix with O's in...

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

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