diff --git a/ch11/ch11-exercise-solutions.ipynb b/ch11/ch11-exercise-solutions.ipynb
index 7c9c8ba..a33a30b 100644
--- a/ch11/ch11-exercise-solutions.ipynb
+++ b/ch11/ch11-exercise-solutions.ipynb
@@ -249,14 +249,14 @@
     "    use qubits = Qubit[BitSizeI(nItems - 1)];\n",
     "    PrepareInitialState(qubits);\n",
     "        \n",
-    "    for idxIteration in 0..NIterations(BitSizeI(nItems)) - 1 {\n",
+    "    for idxIteration in 0..NIterations(BitSizeI(nItems - 1)) - 1 {\n",
     "        ReflectAboutMarkedState(markItem, qubits);\n",
     "        ReflectAboutInitialState(PrepareInitialState, qubits);\n",
     "    }\n",
     "    Message(\"After the normal number of iterations:\");        \n",
     "    DumpMachine();\n",
     "\n",
-    "    for idxIteration in 0..NIterations(BitSizeI(nItems)) - 1 {\n",
+    "    for idxIteration in 0..NIterations(BitSizeI(nItems - 1)) - 1 {\n",
     "        ReflectAboutMarkedState(markItem, qubits);\n",
     "        ReflectAboutInitialState(PrepareInitialState, qubits);\n",
     "    }\n",