+965 A speech class has $4$ freshmen and $3$ sophomores. (Everyone is distinguishable.) In how many ways can they stand in line, so that all of the freshmen are standing next to each other?
+1950 In order to solve this problem, we need to find how many ways we can arrange each age group.
The freshmen can stand in a line 4!=24 ways.
As a group, they can arrange themselves in 4 ways across the line.
The sophoores can stand in a line 3!=6 ways.
Thus, we simply do
24∗4∗6=576
So 576 is our final answer.
Thanks! :)
