The product of a p x q and a r x s matrix is defined only if q = r and, if so, it is a p x s matrix.
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No, it is not.
yes it is
just make the matrices upper triangular by making the values below the digonal zero,and then find how many minors can be calcuted.......
how to multiply two sparse matrices
A product is a operation involving two or more inputs (numbers, matrices, etc). A "number that is half of 12" comprises only a single number and so there cannot be any product.