Q. 44.1( 24 Votes )
Which of the following is not true?
A. rational numbers are closed under addition.
B. rational numbers are closed under subtraction.
C. rational numbers are closed under multiplication.
D. rational numbers are closed under division.
Answer :
Any rational number “a” is not defined in the condition when 
,thus rational numbers are not closed under division.
(a) True because the addition of two rational number is a rational number.
(b) True because subtraction of two rational number is a rational number.
(c) True because multiplication of two rational number is a rational number.
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