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Which of the following binary operations is not commutati...

Which of the following binary operations is not commutative?

A.

ab=1a+1b

B.

ab=a+bab

C.

ab=2a+2b+ab

D.

ab=ab+ab

Correct answer is D

All other options given are commutative i.e. ab=ba, except option D.

ab=ab+ab

ba=ba+ba

ab=(ba)ba