Given an array of integers arr, write a function that returns true if and only if the number of occurrences of each value in the array is unique. Input: arr = [1,2,2,1,1,3] Output: true Explanation: ...

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If you use Excel 40 hours a week (and those are the weeks you are on vacation), welcome to the MrExcel channel. Home to 2,400 free Excel tutorials. Bill "MrExcel" Jelen is the author of 67 books about ...