diff --git a/031_pin_decoder.py b/031_pin_decoder.py
index 7f2f2e4..2ae09dd 100644
--- a/031_pin_decoder.py
+++ b/031_pin_decoder.py
@@ -1,4 +1,4 @@
-from itertools import product
+from itertools import product # Bu modül elemanlari kartezyen sekilde bir araya getiriyor.
 
 def get_pins(observed):
     decoder= [("0","8"),("1","2","4"),["2","1","3","5"],("3","2","6"),\
@@ -51,11 +51,5 @@ def get_pins(observed):
 #        '9': ('6', '8', '9'), '0': ('0', '8')}
 
 # observed = "12"
-# # def get_pins(observed):
-# #     return [''.join(a) for a in product(*(PIN[i] for i in observed))]
-# # print(get_pins("12"))
-
-# k = list(product(*(PIN[i] for i in observed)))
-# l = [*(PIN[i] for i in observed)]
-# print(l)
-# print(k)
\ No newline at end of file
+# def get_pins(observed):
+#     return [''.join(a) for a in product(*(PIN[i] for i in observed))]
diff --git a/032_permutations.py b/032_permutations.py
new file mode 100644
index 0000000..2771836
--- /dev/null
+++ b/032_permutations.py
@@ -0,0 +1,8 @@
+# daily-python-challenge
+# Define a “function” to calculate permutation of 2 numbers.
+# Reminder: P(n,r) = n!/(n-r)!
+# Clue: Defining a function that calculates factorial of given number, may be helpful.
+
+from itertools import permutations
+def P(n,r):
+    return len(list(permutations(range(n),r)))
\ No newline at end of file