diff --git a/lecture_7_preparing_basis_states.ipynb b/lecture_7_preparing_basis_states.ipynb
index 96199f1..c3874ca 100644
--- a/lecture_7_preparing_basis_states.ipynb
+++ b/lecture_7_preparing_basis_states.ipynb
@@ -446,7 +446,7 @@
     "\\begin{align}\n",
     "\\begin{pmatrix} 1\\\\0 \\end{pmatrix} \\otimes\n",
     "\\begin{pmatrix} 1\\\\0 \\end{pmatrix} \\otimes\n",
-    "\\begin{pmatrix} 0\\\\1 \\end{pmatrix}\n",
+    "\\begin{pmatrix} 1\\\\0 \\end{pmatrix}\n",
     "\\end{align}"
    ]
   },