Question

If $a$ & $b$ are two whole numbers then commutative law is applicable to subtraction if and only if

• A. $a=b$
• B. a $\ne$ b
• C. $a>b$
• D. $a<b$

Answer 1

The correct option is A $a=b$

If $a=b$ then $a-b=0$ and $b-a=0$
so $a-b=b-a$
Hence commutative law holds good