Question

Find the number of permutations of 5 distinct keys if they are placed:
a. on a line

b. on a circle

c. on a key ring

Answer 1

Not 100% sure - but

a. 5!
b. 5!/5 = 4!
c. 5!/5 = 4!

Answer 2

not sure if the key ring is supposed to be different than the circle.