6. Here you have 4 choices to make: a chicken dish, a pork dish, a beef dish, and a vegetarian dish. Think of having four positions and write down the number of possible ways in which to fill each position.
| chicken dish | pork dish | beef dish | vegetarian dish |
| 6 | 7 | 9 | 5 |
Each choice is independent of the other choices so the total number of meal combinations is 6 · 7 · 9 · 5 = 1890.