diff --git a/__pycache__/__init__.cpython-36.pyc b/__pycache__/__init__.cpython-36.pyc
index 2ba0c81..9beb1ef 100644
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diff --git a/q01_cond_prob/__pycache__/__init__.cpython-36.pyc b/q01_cond_prob/__pycache__/__init__.cpython-36.pyc
index a5c1ab2..e4af335 100644
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diff --git a/q01_cond_prob/__pycache__/build.cpython-36.pyc b/q01_cond_prob/__pycache__/build.cpython-36.pyc
index 4654504..b5d88d6 100644
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diff --git a/q01_cond_prob/build.py b/q01_cond_prob/build.py
index 46a16ee..551def0 100644
--- a/q01_cond_prob/build.py
+++ b/q01_cond_prob/build.py
@@ -1,3 +1,4 @@
+# %load q01_cond_prob/build.py
 # So that float division is by default in python 2.7
 from __future__ import division
 
@@ -7,6 +8,12 @@
 
 
 # Enter Code Here
+def cond_prob(df):
+    all_houses = df.shape[0]
+    houses_in_OldTown = df[df['Neighborhood'] == 'OldTown'].shape[0]
+    conditional_prob = (houses_in_OldTown/ all_houses) * ((houses_in_OldTown-1)/ (all_houses-1)) * ((houses_in_OldTown-2)/ (all_houses-2))
+    return conditional_prob
+cond_prob(df)
 
 
 
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