Permutations and Combinations

If the ticket box has 9 tickets (one for each of you), in how many ways can I draw 2 names?

When order doesn't matter in a problem, you use which of the following to solve it?

20 people are in a spelling bee.  How many ways can 1st and 2nd places be awarded?

6 types of salads, 2 kinds of chips and 4 drinks at lunch.  How many different lunch combos?

15 people are in your PE class.  You are choosing 4 for your team.  How many ways are possible?

Passcodes for a phone come in 4 digits using 1-9, with no repeat.  How many are possible?

Possible security code combinations on an alarm system.  nCr, nPr, or neither?

Dealing a hand of 5 cards out of a deck of 52 playing cards.  nCr, nPr, neither?