How many labeled binary tress can be made with n nodes?
Number of binary trees that can be made are(2nCn)/n+1 and when we want them labelled then we have to count for the arrangements as well so total number will ((2nCn)/n+1)*n! when combination is multiplied by n! that is the number of way we can do labeling.
Seven girls A, B, C, D, E, F and G sit in a row facing towards the north (not necessarily in the same order). D sits fifth to the right of A. D does not...
Eight people K, M, F, I, L, J, H and G are sitting in a straight row and all are facing north. K sits third from one of the extreme ends of the line. M ...
Who sits 2nd to the left of J?
Which of the following is true?
What is position of V with respect to the one who visit Kanpur?
Who among the following sits third to the right of C?
How many persons sit between T and the one who faces K?
Who among the following person sits second to the left of L?
Seven friends J, K, L, M, P, Q and R are sitting in a row facing east. K is sitting between Q and J. R is to the immediate left of M. Two friends are si...
How many persons are older than Q?
