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distinct binary search trees can be created distinct keys

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How many distinct binary search trees can be created out of 4 distinct keys?

A	4
B	14
C	24
D	42

asked in trees, binary search trees, binary heaps by gate

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B

14

No. of BST= ²ⁿC_n/(n+1)

therefore ⁸C₄/5 =14 option b

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