Minimum degree of t=1 for a b-tree, Computer Engineering

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Why don't we permit a minimum degree of t=1 for a B-tree?

According to the definition of B-Tree, a B-Tree of order n means that every node in the tree has a maximum of n-1 keys and n subtrees. Therefore a B-Tree of order 1 will have maximum 0 keys, i.e. no node can have any keys so such a tree is not possible and as we can't permit a minimum degree of t=1 for a B-Tree.

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