Hi, I'm stuck in these two problems. Can somebody help me? Thanks.

1. I've decided that the mentor group should be made up of 3 girls and 3 boys. Of the students who have A's 9 of them are girls and 6 are boys. How many ways can I form a group of 3 boys and 3 girls?

2. A pizza shop offers the following toppings: 8 different vegetables, 5 different meats, and 4 different cheeses.

How many ways can 4 toppings be selected where:

a) All the toppings are vegetables. (I think this one is 70)

b) All the toppings are meat.

c) There is only cheese on the pizza

d) There are 2 vegetables, 1 meat and 1 cheese

e) There are 3 meats and 1 cheese.