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permutation or combination?

Direction:Determine if the situation is a permutation or a combination.

1.selecting 3 vowels in an alphabet.
2.Opening a combination lock
3.classroom seating arrangement .
4.winning a lotto numbers.
5.four digit numbers divisible by 10 that can be formed from numbers 2,5,6,8,9 and 0 such that no number repeats.
6.setting up a 6-digit ATM pin.
7.Arranging guests in a round table.
8.Grouping 100 learners with 5 members each group.
9.Determining the top 10 in a class.
10.Selecting 3 letters in the word MISSISSIPPI.​