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For how many vertices in a set, is top tree defined for underlying tree?(a) 3(b) 4(c) 5(d) 2My enquiry is from Binary Trees in chapter Binary Trees of Data Structures & Algorithms II have been asked this question in an interview for job.

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Right answer is (d) 2

The BEST I can explain: Top tree is defined for a SET having a maximum of 2 VERTICES for its underlying tree. Those sets having at maximum 2 vertices is CALLED External Boundary Vertices.



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