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What is NaN called?

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What is NaN called? (a) Not a Number (b) Not a Numeric (c) Number and Number (d) Number a Numeric I had been asked this question in semester exam. Question is taken from Overview of R in division History, Overview and Getting Started of R Programming Select the correct answer from above options

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Correct answer is (a) Not a Number For explanation I would say: NaN is called Not a Number. It is the full form of NaN. Full forms can be viewed in R studio by typing help. A NaN value is also NA but the converse is not true. The value NaN represents an undefined value.

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