Counting pigs problem

Problem of counting pigs

Problem description

There are N pigs in a hog log. Select Q of them once. Then put them back. After M times selecting, ask the expectation value of the number (k) of pigs that have ever been selected.

The code

• simulates the process of selecting pigs.
• gives recursion formula of the probability of (n, m, q, k) event.
  That is, select from $n$ pigs $m$ times with $q$ each time that results in $k$ pig(s) been selected.

About the author:

• Ning Sun, [email protected]