You have to solve a system of equations Ax=b. An answer with a relative error smaller than 10 You use the PA=LU decomposition algorithm. Knowing that cond(A) ~ 105, how many significant digits at least you need to carry forward in your calculations? is required. Select one: a. 11 b. 6 c. Doesn't matter, as PA=LU is an exact algorithm (no approximations). As long we use all digits from the system we solve we always get an exact answer. d. 5 e. 16 C

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