Question

Find the number of different necklaces that can be made from 21 identical pearls and
2 different diamonds.(Consider clockwise and anti-clockwise as same arrangement)

Answer 1

Step-by-step explanation:

After fixing the places of three pearls, treating 3 specific pearsl=1 units. So , we have now 18 pearls+1 unit=19 and the number of arrangement will be (19-1)!=18! <br> also, number of ways of 3 pearls can be arranged between themselves is 3!=6. since, there is no distinction between the clockwise and anti-clockwise arrangement. So, the required number of arrangements