added various scripts

probability.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+import sys
+import random
+
+from random import shuffle
+from collections import Counter
+
+
+def main():
+    employees = []
+    for i in range(0, 19):
+        employees.append(1)
+    for i in range(0, 23):
+        employees.append(0)
+
+    count = 0
+    for i in xrange(1, 1000001):
+        temp = employees[:]
+        shuffle(temp)
+        if Counter(temp[0:11])[1] == 4:
+            count += 1
+
+    print count / 1000000.
+
+
+if __name__ == '__main__':
+    main()
+    sys.exit(0)