Python Best Solution
\n# Code\n\nclass Solution:\n    def countVowelStrings(self, n: int) -> int:\n        mul=1\n        j=1\n        for i in range(5,5+n):\n            mul=(mul*i
\n# Code\n```\nclass Solution:\n    def countVowelStrings(self, n: int) -> int:\n        mul=1\n        j=1\n        for i in range(5,5+n):\n            mul=(mul*i)//j\n            j+=1\n        return mul\n        \n```
['Python3']