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What does the typeof is.na mean? Why is it different from that of mean? Find help for the colon operator; what does it do? What

What does the typeof is.na mean? Why is it different from that of mean? Find help for the colon operator; what does it do? What is the type of its return value? Use the predicate testing functions to determine the storage mode of the expressions 1:3 and 1.3:4.2.

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