Check if Array is Good: coding question

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Determine whether nums is a permutation of base[n] = [1,2,...,n,n] where n is the array's maximum. Equivalently, check that len(nums) == n+1 and numbers 1..n-1 each appear once while n appears twice (and no other values occur).

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Leetcode 2784. Check if Array is Good
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Check if Array is Good

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Check if Array is Good

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