SOLUTION: If A is a 3 � 4 matrix, B is a 4 � 12 matrix, and C is a 12 � 2 matrix, then CBA is: a. 13,824 b. a 3 � 4 � 12 matrix c. a 3 � 2 matrix d. none of the above, these matrices d

Question 156047: If A is a 3 � 4 matrix, B is a 4 � 12 matrix, and C is a 12 � 2 matrix, then CBA is:
a. 13,824
b. a 3 � 4 � 12 matrix
c. a 3 � 2 matrix
d. none of the above, these matrices do not match up
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Notice how B is 4 � 12 and A is 3 � 4

The number of columns in matrix B (12) do NOT equal the number of rows in matrix A (3). So this means that BA is not possible. So the answer choice is d) none of the above, these matrices do not match up
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