GATE | GATE-CS-2007 | Question 13

The maximum number of binary trees that can be formed with three unlabeled nodes is:
(A) 1
(B) 5
(C) 4
(D) 3


Answer: (B)

Explanation: See Question 2 of https://www.geeksforgeeks.org/data-structures-and-algorithms-set-10/

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