Question 3 The product AB of two matrices A and B is possible if:

Topic: Matrices

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A and B have the same number of rows.The number of columns of A is equal to the number of rows of B.The number of rows of A is equal to the number of columns of B.A and B have the same number of columns

Answer

Exam answer

(b) The number of columns of A must equal the number of rows of B.

Explanation

For AB to exist, the inner dimensions must be equal.

In words

The number of columns of A must equal the number of rows of B.

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