Test: Linear Algebra

1.

What is dimension criteria to multiply two matrices ?

 can only be multiplied if the number of rows in  equals the number of columns in 

 can only be multiplied if the number of rows in  equals the number of rows in 

 can only be multiplied if the number of columns in  equals the number of columns in 

 can only be multiplied if the number of columns in  equals the number of rows in 

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