Python3 ✅✅✅ || easy and fast || 5 lines
Code\n\nclass Solution:\n    def isFascinating(self, n: int) -> bool:\n        num = str(n)\n        num += str(2 * n)\n        num += str(3 * n)\n        count
# Code\n```\nclass Solution:\n    def isFascinating(self, n: int) -> bool:\n        num = str(n)\n        num += str(2 * n)\n        num += str(3 * n)\n        counts = [num.count(x) for x in num]\n        return "0" not in num and counts.count(1) == len(counts)\n```\n![image.png](https://assets.leetcode.com/users/images/a7e473d2-17a6-446a-bef2-df5bd3ca82ba_1687148819.7501976.png)\n\n![image.png](https://assets.leetcode.com/users/images/e1619ae5-35a7-4b6c-bcb9-66b1716d4211_1687148841.0468395.png)\n
['Python3']