Pij = term in product matrix
Pij = sum over j of Aij Bji
If Akj = 0 for some i = k and all j
Then the product row Pkj = sum over j of AkjBkj
But Akj = 0 for all j
a) Show that if A has a row of zeros and B is any matrix for which AB is defined, then AB also has a row of zeros.
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