recursive algorithms - Recursion tree T(n) = T(n/3) + T(2n/3) + cn

I have a task: Explain that by using recursion tree that solution for: $T(n)=T(\frac n3)+T(\frac {2n}{3})+cn$ Where c is constance, is $\Omega(n\lg n)$ My solution: Recursion tree for $T(n)=T(\fra

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The recurrence relationT(1) = 2T(n) = 3T (n/4) + n has the solution T(n) equal toO(n)O(logn)O(n3/4)none of these

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