Question

suppose a={2,5,7}. list the elements of p(a).

Answer 1

p(a) = permutations of a

For a set of size n there are n! permutations. in this case 3! = 6

p({2,5,7}) = ({2,5,7},{2,7,5},{5,2,7},{5,7,2},{7,2,5},{7,5,2})