In a complete k-ary tree, every internal node has exactly k children or no child. The number of leaves in such a tree with n internal nodes is:
(B) (n – 1) k+ 1
(C) n( k – 1) + 1
(D) n(k – 1)
Explanation: For an k-ary tree where each node has k children or no children, following relation holds
L = (k-1)*n + 1
Where L is the number of leaf nodes and n is the number of internal nodes.
since its a complete k tree, so every internal node will have K child
Let us see following for example
o / | \ o o o / | \ / | \ / | \ o o o o o o o o o k = 3 Number of internal nodes n = 4 Number of leaf nodes = (k-1)*n + 1 = (3-1)*4 + 1 = 9
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