Q. 3
The numerical expression 
shows that
A. rational numbers are closed under addition.
B. rational numbers are not closed under addition.
C. rational numbers are closed under multiplication.
D. addition of rational numbers is not commutative.
Answer :
+ (
) = 
In the given expression the addition of two rational numbers is given and the result obtained is also a rational number.
(b) Incorrect as (a) is true and proved.
(c) Incorrect the operation performed is addition not Multiplication (Irrelevant option).
(d) Incorrect no commutative operation is performed here (Irrelevant option).
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