Answer:
Step-by-step explanation:
The combinations are defined as
[tex]C^{r}_{n}=\frac{n!}{(n-r)!}[/tex]
Where [tex]n[/tex] is the total number of elements and [tex]r[/tex] is the number of letter we are gonna picke, which is two. Using this information, we have
[tex]C^{2}_{6}=\frac{6!}{(6-2)!}=\frac{6!}{4!}=\frac{6 \times 5 \times 4!}{4!}=30[/tex]
Therefore, there are 30 possible combinations of picking two letters.
