2. 5*4*3 = 60

3. 5*4 * 7*6*5 = 4200

4. 5*4*3*2 * 7*6*5*4 * 2 = 201,600

To explain,

In the first problem, there are 5 choices for what to take from the first group. Then, no matter which was chosen there are 7 choices to decide among for the second, and then 2 choices for the last group. Multiply and you get the total number of possibilities.

In the second problem, choose any of the five items. Then choose one of the four that remain, then choose any of the three that are left. Multiply again.

The other two are simply combinations of these facts.

I hope this helps!

2. 1 meal

3. 2 meals

4. 1 meal

I am not sure of the answers..