Hi! Can someone check my answers? Thanks!!

Question

Directions: Tell whether the following questions are either permutations or combinations.

1.) Number of ways the Junior class can elect a committee of officers - President, Vice President, Secretary and Treasurer. (my answer: combinations)

2.) Number of three-digit pin numbers for a debit card. (my answer: permutations)

3.) Number of different arrangements of three types of flowers from an array of 20 types. (my answer: permutations)

4.) Number of ways 10 people can line up in a row for concert tickets. (my answer: combinations)

Answer 1

#1 Permutations, since each office is unique. If just selecting a committee, then it'd be combinations, since the member roles are all the same.

#2,3 ok
#4 is also permutations, since the order in line matters.