Update 'algorithms/recursion/interview_challenge/interview_problems.ipynb'

algorithms/recursion/interview_challenge/interview_problems.ipynb

@@ -34,7 +34,7 @@
     "    if len(arr) == 0:\n",
     "        return 1\n",
     "    else:\n",
-    "        return len(arr) * product(arr[1:])\n",
+    "        return arr[0] * product(arr[1:])\n",
     "\n",
     "product([1, 2, 3, 4, 5])"
    ]