A subset of a linearly dependent vector set is linearly dependent. (b) If the columns of AB are linearly independent, then so are the columns of B. (c) If dim(V) = n, then any spanning set consisting ofn vectors in V is a basis of V. (d) If det A = 0 then at least one of the cofactors must be zero. (e) If A = A^2, then det(4) is either 0 or 1. (f) If A is invertible then A^TA is invertible. 2) (I) If a linear system of m equations in n variables has a unique solution, then a) m > n, b) m