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What is the best case height of a B-tree of order n and which has k keys

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What is the best case height of a B-tree of order n and which has k keys?
a) logn (k+1) – 1
b) nk
c) logk (n+1) – 1
d) klogn

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Answer: a
Explanation: B-tree of order n and with height k has best case height h, where h = logn (k+1) – 1. The best case occurs when all the nodes are completely filled with keys.

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