Permutation or Combination

In how many ways can three guitar players be seated in first, second, and third seats in the orchestra?

In how many ways can five players for a team be chosen from seven players?

In how many ways can 5 finalists be chosen from 20 participants?

In how many ways can five cars line up in a race?

Given five different pizza toppings, how many pizza variant are possible using 4 different topings?

150 people are going to run a race. In how many ways can we select the top 3 runners which will earn gold, silver and bronze?