Question

Given a set S = {a, b, c}, find the subsets of two elements (r = 2) when 1. repetition is allowed and order matters. 2. repetition is not allowed but order matters. 3. repetition is not allowed and order does not matter. 4. repetition is allowed but order does not matter. 5. Show all the permutations (order matters) of the three elements in set S.

Answer 1

i am not good with math but b i think.