Let the matrices A7x7, B12x7, C7x8 and D9x9 be given. Which of the following statement or state- ments are correct? I. For i < j let a;j = 0. A = [aj] is invertible if and only if a; +0. II. The rank of the matrix BC is at most 7. III. The matrix D = [dj] = [P – ²] is anti-symmetric. IV. The multiplication AC is well-defined. (a) I, III and IV (b) II and IV (c) I and III (d) IV and V (e) All of them

Elementary Linear Algebra (MindTap Course List)
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Chapter4: Vector Spaces
Section4.6: Rank Of A Matrix And Systems Of Linear Equations
Problem 77E: Let A and B be square matrices of order n satisfying, Ax=Bx for all x in all Rn. a Find the rank and...
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Let the matrices A7x7, B12 x7, C7x8 and Dyx9 be given. Which of the following statement or state-
ments are correct?
I. For i < j let aj = 0. A = [a;j] is invertible if and only if a #0.
II. The rank of the matrix BC is at most 7.
III. The matrix D = [dij] = [P – f] is anti-symmetric.
IV. The multiplication AC is well-defined.
(a) I, III and IV
(b) II and IV
(c) I and III
(d) IV and V
(e) All of them
Transcribed Image Text:Let the matrices A7x7, B12 x7, C7x8 and Dyx9 be given. Which of the following statement or state- ments are correct? I. For i < j let aj = 0. A = [a;j] is invertible if and only if a #0. II. The rank of the matrix BC is at most 7. III. The matrix D = [dij] = [P – f] is anti-symmetric. IV. The multiplication AC is well-defined. (a) I, III and IV (b) II and IV (c) I and III (d) IV and V (e) All of them
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