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Q.

Rational numbers are closed under addition because 

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a

The sum of any three rational numbers is independent of the way the three numbers are grouped together 

b

Any two rational numbers can be added in any order 

c

The sum of any two rational numbers is again a rational number 

d

The sum of 0 and any rational number is the same rational numb

answer is B.

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Rational numbers are closed under addition because