diff --git a/knowledge.ipynb b/knowledge.ipynb
index c21de646c..2f4276452 100644
--- a/knowledge.ipynb
+++ b/knowledge.ipynb
@@ -1233,10 +1233,8 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
     "Lets look at the pseudocode for this algorithm"
    ]
diff --git a/learning_apps.ipynb b/learning_apps.ipynb
index 339d407a2..bff723050 100644
--- a/learning_apps.ipynb
+++ b/learning_apps.ipynb
@@ -93,7 +93,7 @@
       "Training images size: (60000, 784)\n",
       "Training labels size: (60000,)\n",
       "Testing images size: (10000, 784)\n",
-      "Training labels size: (10000,)\n"
+      "Testing labels size: (10000,)\n"
      ]
     }
    ],
@@ -101,7 +101,7 @@
     "print(\"Training images size:\", train_img.shape)\n",
     "print(\"Training labels size:\", train_lbl.shape)\n",
     "print(\"Testing images size:\", test_img.shape)\n",
-    "print(\"Training labels size:\", test_lbl.shape)"
+    "print(\"Testing labels size:\", test_lbl.shape)"
    ]
   },
   {
diff --git a/probability.ipynb b/probability.ipynb
index 028c17bde..58e9b1994 100644
--- a/probability.ipynb
+++ b/probability.ipynb
@@ -1728,6 +1728,7 @@
     }
    ],
    "source": [
+    "umbrella_prior = [0.5, 0.5]\n",
     "belief_day_1 = forward(hmm, umbrella_prior, ev=True)\n",
     "print ('The probability of raining on day 1 is {:.2f}'.format(belief_day_1[0]))"
    ]