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Consider a B+-tree in which the maximum number of keys in a node is 5. What is the minimum number of keys in any non-root node?

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a B-tree of order m is a tree which satisfies the following properties:

- Every node has at most m children.
- Every non-leaf node (except root) has at least ceil(m⁄2) children.
- The root has at least two children if it is not a leaf node.
- A non-leaf node with k children contains k−1 keys.
- All leaves appear in the same level, and carry information.

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