Let A a b c d e Express the following set as a list enclose

Let A = {a, b, c, d, e}. Express the following set as a list enclosed in braces: {X: X subset A and |X| =3} Then find P({2, empty set}) P(P({2,empty set}))

Solution

we are given A is a superset that is A has equal to or more elements than the set X

the set X has elements {3,-3,phi}

A will have {a,b,c,d,e,3,-3,phi}

the set A will ahve all the elements of X and other elements as well.