C# Linq OneLiner
\n\npublic class Solution {\n    public bool IsFascinating(int n)\n      => $"{n}{n*2}{n*3}".OrderBy(x => x).SequenceEqual("123456789");\n}\n
\n```\npublic class Solution {\n    public bool IsFascinating(int n)\n      => $"{n}{n*2}{n*3}".OrderBy(x => x).SequenceEqual("123456789");\n}\n```
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