Principle of Inclusion and Exclusion problems

[Swayam221]

the problem would generate a sample space of 3 sets and assign random no. of elements to each set and their intersections.
problem will be to calculate the no. of elements in their union.
example problem :
Suppose you are using the inclusion-exclusion principle to compute the number of elements in the union of 3 sets.
Each set has 14 elements.
The pair-wise intersections have 9 elements each.
There are 3 elements in the intersection of all four sets
What is the size of the union?
answer:
(3x14)-(3x9)+3=18

i would like to add the function for this problem. please assign it to me