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@shruti ur formula is gud 1 but it is valid if u are allowed to use any no of nodes (within the given no) to make a tree
- harshsingla450 February 12, 2011i.e. if n=3 then u cn use n=0,1,2,3 to make a bt....bt i if this ques is saying that u hv 3 nodes and u hv to mk distinct trees out of it, then u cant use this formula..then the formula is that given by "csehrs" in the last.. go 4 it