Question: (a) Let A be an m n matrix with a row consisting entirely of zeros. Show that if B is an n p

(a) Let A be an m × n matrix with a row consisting entirely of zeros. Show that if B is an n × p matrix, then A B has a row of zeros.
(b) Let A be an m x n matrix with a column consisting entirely of zeros and let B be p × m. Show that BA has a column of zeros.

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