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試卷名稱：109年 - 109 國立中山大學_碩士班招生考試_電機系(乙組)：工程數學乙#106088
年份：109年
科目：中山◆電機◆工程數學乙
18. Consider the linear equation Ax = b, where A = [a1, a2, a3, a4 ] ∈ 
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 lincarly dependent.
(E) rank([A,b]) = 