Solve the given problems on permutation accurately with solution.

1.In how many different ways can 4 positions in a relay team be filled by 10 qualified athletes?

2.How many ways can we order 7 computers if we have only space for 4?

3.How many ways can 9 people be seated at a round table?

4.If there are 10 people and only 6 chairs are available, in how many ways they can be seated?

5. In how many distinguishable permutations are possible with all the letters of the word STATISTICS?​​