Find the number of ways of preparing a chain with 5 different

Home » Aptitude » Permutation and Combination » Question

Find the number of ways of preparing a chain with 5 different coloured beads ?

1. 18
2. 24
3. 12
4. 30

Correct Option: C

Neglecting the direction of beads in the chain, number of ways of preparing a chain with 5 different coloured beads
= (1/2) x (5 -1)! = (1/2) x 4! = 24/2 = 12