Check if The Number is Fascinating: coding question

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Given a 3-digit integer n, form the concatenation of n, 2n, and 3n and return true if that 9-digit string contains each digit 1–9 exactly once (and no zeros), otherwise return false.

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Leetcode 2729. Check if The Number is Fascinating
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Check if The Number is Fascinating

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Check if The Number is Fascinating

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