How do you multiply matrices?

How do you multiply matrices?
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The browser used by this site is not really designed for this answer but here's an attempt.Suppose A and B are matrices with dimensions pxq and qxr where p, q and r are positive integers.Then the (i, j)th term in AxB is the sum, over all k, of ai,k*bk,j. where ai,k is the element in the ith row and kth column of A.
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