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If ab=ab, then ba is called 

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a
the additive inverse of ab
b
the multiplicative inverse of ab
c
Both a and b 
d
multiplicative identity of ab

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detailed solution

Correct option is B

Since, ab=abab=ab×1ab×ba=1

ba is called the multiplication inverse of ab. Hence ab×ba=1

So ba is not additive inverse of ab and also

ab=abab+(ab)=0

So , abis additive inverse of ab

But here asked about ba

B: Since ab×ba=1. Clearly  says that bais multiplicative inverse of ab

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