diff --git a/ipynb/Probability.ipynb b/ipynb/Probability.ipynb
index 56afedd..4e1b22f 100644
--- a/ipynb/Probability.ipynb
+++ b/ipynb/Probability.ipynb
@@ -26,16 +26,16 @@
     "Laplace nailed it. To untangle a probability problem, all you have to do is define exactly what the cases are, and careful count the favorable and total cases. Let's be clear on our vocabulary words:\n",
     "\n",
     "\n",
-    "- **[Trial](https://en.wikipedia.org/wiki/Experiment_(probability_theory%29):**\n",
+    "- **[Trial](https://en.wikipedia.org/wiki/Experiment_%28probability_theory%29):**\n",
     "  A single occurrence with an outcome that is uncertain until we observe it. \n",
     "  <br>*For example, rolling a single die.*\n",
-    "- **[Outcome](https://en.wikipedia.org/wiki/Outcome_(probability%29):**\n",
+    "- **[Outcome](https://en.wikipedia.org/wiki/Outcome_%28probability%29):**\n",
     "  A possible result of a trial; one particular state of the world. What Laplace calls a **case.**\n",
     "  <br>*For example:* `4`.\n",
     "- **[Sample Space](https://en.wikipedia.org/wiki/Sample_space):**\n",
     "  The set of all possible outcomes for the trial. \n",
     "  <br>*For example,* `{1, 2, 3, 4, 5, 6}`.\n",
-    "- **[Event](https://en.wikipedia.org/wiki/Event_(probability_theory%29):**\n",
+    "- **[Event](https://en.wikipedia.org/wiki/Event_%28probability_theory%29):**\n",
     "  A subset of the sample space, a set of outcomes that together have some property we are interested in.\n",
     "  <br>*For example, the event \"even die roll\" is the set of outcomes* `{2, 4, 6}`. \n",
     "- **[Probability](https://en.wikipedia.org/wiki/Probability_theory):**\n",