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Which of the following merges two variables into one?

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Which of the following merges two variables into one? (a) spread() (b) gather() (c) separate() (d) unite() This question was addressed to me in my homework. My doubt stems from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming Select the correct answer from above options

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The correct option is (b) gather() Best explanation: The unite() function is a convenience function to paste together multiple variable values into one.

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