问题描述：
求助...555急急..万分感谢.英文数学题
if matrix A has dimensions m*n and matrix B has dimensions n*p,where m,n,and p are distinct positive integers,which of the following statements must be true?
1,the product BA does not exist
2,the product AB exists and has dimensions m*p
3,the product AB exists and has dimensions n*n
if matrix A has dimensions m*n and matrix B has dimensions n*p,where m,n,and p are distinct positive integers,which of the following statements must be true?
1,the product BA does not exist
2,the product AB exists and has dimensions m*p
3,the product AB exists and has dimensions n*n
问题解答：
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