Tell weather the following if it is permutation or not permutation

1. Choosing 5 question out of 10 questions in a test
2. Opening a combination lock
3. Winning in a contest
4. Selecting 7 people to form a student affairs committee
5. Forming triangles from 6 distinct points in which no 3 points are collinear
6. Assigning seats to quests at dinner
7. Drawing a set of 6 numbers in a lottery containing no 1 to 45
8. Entering the PIN (personal identification number) of your ATM card
9. Selecting 3 posters to hang out of 6 different posters
10. Listing the elements of subsets of a given sets​​