Question: 1. (5 points) There are 2 different binary trees with 2 nodes if we don't care about the key values in them but only their

1. (5 points) There are 2 different binary trees with 2 nodes if we don't care about the key values in them but only their shapes we get: and O O Use recursion to argue that there are 5 different binary trees with 3 nodes. How many different binary trees with 4 nodes are there ? Justify your

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