خواص مقياس العدد المركب

Let's solve question number nine from this exam paper. The question asks for the number of ways to arrange eight students in a row such that a specific student always sits at the beginning of the row.

When we arrange students in a row, the total number of positions is eight. However, the problem specifies that a particular student must occupy the first seat.

Since the first position is reserved for that one specific student, there is only one choice for the first seat.

Now, we have seven students remaining to be arranged in the remaining seven seats.