Questions 1. Let A be a 4 x 4 matrix with rows vi, v2, v3, VA. If det(A) = 6, and B = then det(B) = det(A) = 6. 2. If matrix B is obtained by swaping rows of matrix A 3 times, if det(A) = -4, then det (B) = -4. 3. If B is obtained from A by dividing a row of A by 2. If det(A) = 10, then det(B) = 5. 4. If B is obtained from A by dividing a row of A by ?. If det(A) = 10, then det (B) = 5. 5. If rref(A) = In, then det(A) # 0