How do i solve this when there’s no specific domain?

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Select the sequences that are geometric.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?