Which of the following binary operations is not commutati...
Which of the following binary operations is not commutative?
a∗b=1a+1b
a∗b=a+b−ab
a∗b=2a+2b+ab
a∗b=a−b+ab
Correct answer is D
All other options given are commutative i.e. a∗b=b∗a, except option D.
a∗b=a−b+ab
b∗a=b−a+ba
a−b=−(b−a)≠b−a
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