WAEC - Further Mathematics (2017 - No. 11)
How many ways can 6 students be seated around a circular table?
36
48
120
720
คำอธิบาย
In a circular seating arrangement, we fix the position of one person and then rotate the others, so we have
\((6-1)! = 5! = 5\times4\times3\times2 = 120\)