In which of the following number systems, the addition is closed?I. Na – McqOptions

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1.	In which of the following number systems, the addition is closed?I. Natural numbersII. Whole numbersIII. Rational numbersIV Integers
A.	III and IV
B.	II and III
C.	I, III and IV
D.	I, II, III and IV
Answer» E.

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