Reflexive, symmetric, transitive and equivalence relationsMedium

Sum of Elements in Relation Range

Let S = N ∪ {0}. Define a relation R from S to R by :
$R = \left\{ {\left( {x,y} \right):{{\log }_e}y = x{{\log }_e}\left( {\frac{2}{5}} \right),x \in S,y \in R} \right\}$
Then, the sum of all the elements in the range of R is equal to

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