A function multiply_A(x) that computes Ax, the result of multiplying a matrix A ∈ Rm×n by a column vector x ∈ Rn that you pass in. What is the smallest number of function calls you need to make, and what x can you pass, to determine: a) the jth column of A; b) the sum of the columns of A (if A has column vectors a1, a2, · · ·, I want the answer a1 +a2 +· · ·); c) the jth row of A?

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