##### Total tree possible--

**Q1**. How many __Binary Tree__ possible with n nodes ?

**Q2.** How many __Ordered Binary Tree__ possible with n nodes ?

**Q3**. How may __BinarySearch Tree__ possible with n nodes ?

**Q1**. How many __Binary Tree__ possible with n nodes ?

**Q2.** How many __Ordered Binary Tree__ possible with n nodes ?

**Q3**. How may __BinarySearch Tree__ possible with n nodes ?

https://stackoverflow.com/questions/3042412/with-n-no-of-nodes-how-many-...

Ordered BST :

With all respect @shivani1234 , please prove answers instead of links .

Prove it by mathematical induction....