diff --git a/100_Numpy_exercises.ipynb b/100_Numpy_exercises.ipynb
index 0e94f62..f3739cc 100644
--- a/100_Numpy_exercises.ipynb
+++ b/100_Numpy_exercises.ipynb
@@ -364,7 +364,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "print(np.unravel_index(100,(6,7,8)))"
+    "print(np.unravel_index(99,(6,7,8)))"
    ]
   },
   {