[Binary tree] Below we have a typical binary tree. 60 20 80 10 70 90 50...

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[Binary tree] Below we have a typical binary tree. 60 20 80 10 70 90 50 a) Please write down the pre-order, in-order and post-order traversal results of the above tree. (9%) b) Does the above tree qualify as a binary search tree (BST)? (4%) [Binary tree] Below we have a typical binary tree. 60 20 80 10 70 90 50 a) Please write down the pre-order, in-order and post-order traversal results of the above tree. (9%) b) Does the above tree qualify as a binary search tree (BST)? (4%)