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July 16th, 2013, 05:25 AM  #1 
Newbie Joined: Jul 2013 Posts: 1 Thanks: 0  Average search cost of an unsuccessful search in a BST?
I'm really bugging on a question I hope somebody here can help me! If we note by the average search cost in the case of a successful search in a binary search tree and in the case of an unsuccessful search, we can say that , where is the internal path length and is the number of nodes in the tree. Prove that and just for a reminder, , where is the external path length of a binary search tree. Thanks a lot for your help! REMINDER: 

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