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Which of the following is not an object of R?

a) calls
b) expressions
c) strings
d) names

Answer: c
Explanation: Calls, expressions and names are the three types of objects that constitute the R language. There is really only one rule about vectors in R, which is that A vector can only contain objects of the same class. R objects can have names, which is very useful for writing readable code and self-describing objects.

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