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Q.

Which of the operations are not commutative for rational numbers?


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a

    Subtraction and division

b

    Multiplication and division

c

    Multiplication and addition

d

    Addition and subtraction 

answer is A.

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Detailed Solution

To find the operations that are not commutative for rational numbers.
Subtraction and division are not commutative for rational numbers because while performing these operations, if the order of numbers is changed, then the result also changes.
For example,
2-1 = 1 and 1-2 =-1
⇒2-1≠1-2
Also,
21≠12
Hence, subtraction and division are not commutative for rational numbers.
Therefore, option 1 is correct.
 
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