Here's the question you clicked on:
Directrix
In how many ways can 5 students be arranged for a group picture with 3 in the first row and 2 in the back row?
Hint: Whatever the answer, would it be the same if the 5 students were all on one row with the question being "In how many ways can 5 students be arranged in a row ( line )for a group photo?
The two questions have the same answer: 120 ways. Three students on the first row and two in the back can be done in the same number of ways as 5 students arranged on one row.
Yu missed it. We're practicing combinatorics.
|dw:1330001939260:dw| each time i fill a place one student is taken from my option to fill the next seat as a single student cannot sit in boh seats
The picture is right. Then, use the multiplication rule. 5*4*3*21 = 120 ways
yeah i forgot to tell the main 'MULTIPLY' part