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HKIMO 2017 Grade 8 National Final (Heat) Set 04 Question 21

HKIMO · HKIMO 2017 Grade 8 National Final (Heat) Set 04

Question 21

Four couples sit together for dinner at a long table. Each couple must sit together. How many seating arrangements are possible?

Editorial seating model: eight distinct people occupy one fixed row of eight seats; each couple is adjacent.