In how many ways can a teacher arrange eight students in a row, including the first, second, and third position holders, if [4] a) The first position holder must be next to the second position holder?

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A: Introduction

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Q: convert to ER  with show relationships

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Topological Sort

Topological sort is a sorting technique that sets up a hierarchy in a process. In this technique, when a directed network has nodes connected by arrows, the root node is placed before the successor node.