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11. (5%) Suppose that the characteristic polynomial of a matrixA is 
p(λ)=λ(λ-1)(λ-2)2(λ+3)3. Which of the following statements about the matrix A is correct? 

(A) The size of A is 4 X 4 

(B) A is invertible 

(C) det( A ) =-128 

(D) (2I -A)x= 0 has nontrivial solutions 

(E) A has nullity O


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11. (5%) Suppose that the characteristic..-阿摩線上測驗