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Question: Answered & Verified by Expert
If $*$ be a binary operation on a set $A$ and $e$ be the identity element w.r.t. *, then $b \in A$ is said to be inverse of $a \in A$ w.r.t. * , if
MathematicsMathematical ReasoningCOMEDKCOMEDK 2017
Options:
  • A $a^{*} e=b^{*} e$
  • B $a=b$
  • C $a * a=b * b$
  • D $a * b=b * a=e$
Solution:
2974 Upvotes Verified Answer
The correct answer is: $a * b=b * a=e$
$b \in A$ is said to be an inverse of a w.r.t. operation $*$ if $a * b=b * a=e$. [by definition]

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