Look at the first vertical bar first, except Chinese, all the other three subjects are arranged, so it is 3,3 (that is, 3! ) Look at the second vertical line. It can't be the same as Wednesday's math and the first class, so there are two kinds. If you fill in a subject in the remaining two spaces, there will be two kinds. There is only one space left, because every horizontal and vertical line can't be repeated. That is a ***4*3! =24

The teacher said that if the grade is not particularly good, we can give up this problem rationally (our teacher also made a mistake)