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Which of the following tests each element of x for membership in y?

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Which of the following tests each element of x for membership in y? (a) y%in%x (b) all(x) (c) any(x) (d) x%in%y I had been asked this question in an interview for internship. I need to ask this question from Commands topic in division Commands, Packages, Visualizing Data and Linear Regression of R Programming Select the correct answer from above options

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Right answer is (d) x%in%y To elaborate: y%in%x tests each element of y for membership in x. x%in%y tests each element of x for membership in y.

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