Problem
COM-B1-M02-P008 Two Students Not Adjacent
#8
★★☆☆☆ Level 2 of 5
Seven students stand in a row. In how many ways can this be done if two specified students must not stand next to each other?
Total minus adjacent.
Total: \(7!=5040\). If the two are adjacent, glue them: \(6!\cdot2=1440\). Answer: \(5040-1440=3600\).
Reinforces complement method.