Simplest Python solution - 1,2 liner
\n# Code\n\nclass Solution:\n    def isFascinating(self, n: int) -> bool:\n        s = str(n)+str(2*n)+str(3*n)\n        return len(s) == 9 and max(Counter(s).v
\n# Code\n```\nclass Solution:\n    def isFascinating(self, n: int) -> bool:\n        s = str(n)+str(2*n)+str(3*n)\n        return len(s) == 9 and max(Counter(s).values()) == 1 and \'0\' not in Counter(s).keys()\n```
['Python3']