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Questions  >>  CBSE XII  >>  Math  >>  Relations and Functions
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Q)

Let $\ast$ be the binary operation on $N$ given by $a \ast b =$ LCM of $a$ and $b$. $(v)$ Which elements of $N$ are invertible for the operation $\ast$ ?

$\begin{array}{1 1} \text{Only 1} \\ \text{1 and 0} \\ \text{Any element in N} \\ \text{Only a and b} \end{array} $

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