Question

7. If a and b are two whole numbers, then commutative law is applicable on subtraction if and only if (A) a = b (B) ab (C) a > b (D) a​

Answer 1

Answer:

a=1

b=2

commutative law

a+b=b+a

this is based on subtraction

a-b=b-a not possible , bcz

1-2=2-1

which results in

-1=1

if we give

a=2

b=1

that is a>b

this is not possible bcz

a-b=b-a

2-1=1-2

which results in

1=-1

if we give

a=1

b=1

that is a=b

a-b=b-a

1-1=1-1

0=0 it satisfied

even if we take ab that is a=1,b=2

ab=ba

1×2=2×1

2=2

ab

a=b