Easy and clean Solution [ Beginner Freindly] python3
```\nclass Solution:\n    def isFascinating(self, n: int) -> bool:\n        s = str(n)\n        \n        s = s + str(2n) + str(3n)\n    \n        ans = set(s)\
```\nclass Solution:\n    def isFascinating(self, n: int) -> bool:\n        s = str(n)\n        \n        s = s + str(2*n) + str(3*n)\n    \n        ans = set(s)\n\n        return len(ans) == 9 == len(s) and \'0\' not in ans\n        \n
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