#### Answer

$120$

#### Work Step by Step

If we want to choose $k$ elements out of $n$ regarding the order, not allowing repetition, we can do this in $_{n}P_k=\frac{n!}{(n-k)!}$ ways.
The order matters here when injecting, thus we have to use permutations. We have $5$ samples for $5$ spots, thus $_{5}P_{5}=\frac{5!}{(5-5)!}=5!=120$