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As far as i Know, just one.

Do you know any formula to calculate how many binary search trees are possible?

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answer:

(2n C n) / (n+1) = ( factorial (2n) / factorial (n) * factorial (2n - n) ) / ( n + 1 )

where 'n' is number of element (integer/string)

like:

N Number of BST

1 1

2 2

3 5

4 14

5 42

6 132

and so on

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15y ago

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