## Thinking Mathematically (6th Edition)

$10$
The order of the chosen vegetables does not matter. Combinations, ${}_{n}C_{r}=\displaystyle \frac{n!}{(n-r)!r!}$ ${}_{5}C_{2}=\displaystyle \frac{5!}{(5-2)!2!}=\frac{5\times 4}{1\times 2}=10$