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Let A be a 3times3 matrix with det(A)=4....

Let A be a `3times3` matrix with det(A)=4. Let `R_(i)` denote the `i^(th)` row of A .If a matrix B is obtained by performing the operation `R_(2)rarr2R_(2)+5R_(3)` on 2A, then `det(B)` is equal to:

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