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Data Structures | Binary Search Trees | Question 4

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How many distinct binary search trees can be created out of 4 distinct keys?

(A)

4

(B)

14

(C)

24

(D)

42



Answer: (B)

Explanation:

number of distinct BSTs = (2n)!/[(n+1)!*n!] .


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Last Updated : 08 Feb, 2013
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