How many different binary search trees can be constructed with 6 different…

The number of distinct binary search trees that can be formed with n distinct nodes is given by the nth Catalan number.
The formula for the nth Catalan number is:
For n = 6:
Calculating:
12! = 479001600
7! = 5040
6! = 720
C_6 = 479001600 / (5040 * 720) = 479001600 / 3628800 = 132
Therefore, the number of distinct binary search trees with 6 nodes is 132.