diff --git a/100 Numpy exercises.ipynb b/100 Numpy exercises.ipynb
index 41b06ecb..88798fcc 100644
--- a/100 Numpy exercises.ipynb	
+++ b/100 Numpy exercises.ipynb	
@@ -2150,12 +2150,7 @@
     "\n",
     "Z = np.random.randint(0,5,(10,3))\n",
     "print(Z)\n",
-    "# solution for arrays of all dtypes (including string arrays and record arrays)\n",
-    "E = np.all(Z[:,1:] == Z[:,:-1], axis=1)\n",
-    "U = Z[~E]\n",
-    "print(U)\n",
-    "# soluiton for numerical arrays only, will work for any number of columns in Z\n",
-    "U = Z[Z.max(axis=1) != Z.min(axis=1),:]\n",
+    "U = Z[~(Z[:,0,None]==Z[:,1:]).all(axis=1)]\n",
     "print(U)"
    ]
   },
diff --git a/100 Numpy exercises.md b/100 Numpy exercises.md
index 0877443d..ae1fb484 100644
--- a/100 Numpy exercises.md	
+++ b/100 Numpy exercises.md	
@@ -1109,12 +1109,7 @@ print(rows)
 
 Z = np.random.randint(0,5,(10,3))
 print(Z)
-# solution for arrays of all dtypes (including string arrays and record arrays)
-E = np.all(Z[:,1:] == Z[:,:-1], axis=1)
-U = Z[~E]
-print(U)
-# soluiton for numerical arrays only, will work for any number of columns in Z
-U = Z[Z.max(axis=1) != Z.min(axis=1),:]
+U = Z[~(Z[:,0,None]==Z[:,1:]).all(axis=1)]
 print(U)
 ```