Question: Chapter 7. Built-In Functions 20. Compose two R functions so as to count the number of distinct elements in a vector named 7.21 An unsorted

Chapter 7. Built-In Functions 20. Compose two R functions so as to count the number of distinct elements in a vector named 7.21 An unsorted 99-element vector named x contains all but one of the first 100 positive integers. Write a single R command that determines the missing integer

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