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R-2.7 Let T be a binary tree such that all the external nodes have the same depth. Let De be the sum of the depths

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R-2.7 Let T be a binary tree such that all the external nodes have the same depth. Let De be the sum of the depths of all the external nodes of T, and let Di be the sum of the depths of all the internal nodes of T. Find constants a and b such that where n is the number of nodes of T

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