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    "### Problem 1\n",
    "Given an array, find out the product of its element using recursion.\n",
    "- Input: [1, 2, 3, 4, 5] \n",
    "- Output: 120"
   ]
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       "20"
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   "source": [
    "def productOfArray(arr):\n",
    "    \"\"\"\n",
    "    calculates the product of all the numbers in array\n",
    "    \"\"\"\n",
    "    if len(arr) == 0:\n",
    "        return 1\n",
    "    else:\n",
    "        return len(arr) * productOfArray(arr[1:])\n",
    "\n",
    "productOfArray([1, 2, 3, 4, 5])"
   ]
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