Question: 71. Let A be an m x n matrix and let B be an n x p matrix. Show that (AB)- = B-A- if either

71. Let A be an m x n matrix and let B be an n x p matrix. Show that (AB)- = B-A- if either (1) or (2) below is true.

(1) A'A = I.

(2) BB' = I.

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