Question 898272
Proper subsets with 3 items in it: 


{7,19,5}, {7,19,6}, {19,5,6}, {5,6,7}



--------------------------------------------------------


Proper subsets with 2 items in it


{7,19}, {7,5}, {7,6}, {19,5}, {19,6}, {5,6}



--------------------------------------------------------


Proper subsets with 1 item in it


{7}, {19}, {5}, {6}



--------------------------------------------------------


Proper subsets with 0 items in it


{ } ... aka the empty set


with any set, there is only one subset that has nothing in it which is the empty set. The empty set is a subset of any set.


-------------------------------------------------------
-------------------------------------------------------


Put all of these proper subsets together to get


{7,19,5}, {7,19,6}, {19,5,6}, {5,6,7}
{7,19}, {7,5}, {7,6}, {19,5}, {19,6}, {5,6}
{7}, {19}, {5}, {6}
{ }



Note: you can denote the empty set as the symbol *[Tex \Large \emptyset]


There are 15 proper subsets listed above.