In how many ways can a teacher arrange 5 students in the front row of a classroom with a total of 20 students?

1,860,480
60,480
2,860,480
860,480

I tried doing this one like five times and I can't get. even though im sure its simple

Question

In how many ways can a teacher arrange 5 students in the front row of a classroom with a total of 20 students?

1,860,480
	60,480
	2,860,480
	860,480

I tried doing this one like five times and I can't get. even though im sure its simple

kropot72 · Answer

The number of permutations of 20 students taken 5 at a time is:
$$P(20, 5)=\frac{20!}{(20-5)!}=20\times19\times18\times17\times16$$

anonymous · Answer

Use factorials! You will get 1,860,480 as the answer, correct me if I'm wrong :)