複選題

18. Consider the linear equation Ax = b, where A = [a1, a2, a3, a4 ] ∈ 620377e0b75c7.jpg and a1, a2, a3, a4 are column vectors of A. Suppose a1 + a2 + a3 + a4 = b. Which of the following statements are true?
(A) The linear equation has exactly one solution.
(B) The linear equation has infinitely many solutions.
(C) No conclusion can be drawn about the number of solutions to the linear equation.
(D) The vectors a1, a2,a3, a4 are linearly dependent.
(E) rank([A,b]) = rank6203784d45af3.jpg

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統計： A(1), B(3), C(0), D(0), E(0) #2861278