Assume that you have member/2 where member(X, Y) checks whether X is an element of a list Y. Complete the first clause of the following Prolog program subset/2 where subset(A, B) will establish a relationship of A being a subset of B. subset([X|R],S) :- %% the body should be... subset([ ],_).

Refer below.

Explanation:

Assume that you have member/2 where member(X, Y) checks whether X is an element of a list Y. Complete the first clause of the following Prolog program subset/2 where subset(A, B) will establish a relationship of A being a subset of B. subset([X|R],S) :- %% the body should be... subset([ ],_).

subset([X|R],S) :-

subset([ ],_).

member(X,S), subset(R,S)

the answer would be 2

since they are only saying that the couple has 20 daughters and so on but they never said that they went to the movies as well therefore the couple was the only people that went to the movies.

hope this ! : 3