mathsishardd
New member
- Joined
- Jan 10, 2018
- Messages
- 7
I'm trying to find the permutations of necklace with 4/6/8 beads each group of different color, each bead in a group indistinguishable from the rest.
All I have so far is (18!/(4!*6!*8!)+9!/2!*3!*4!+??)/36 but I am unsure of what I need to replace the ?? with.
I've seen that it's sometimes replaced with (n/2)! and sometimes (n/2)*(n/2)! + (n/2)*(n/2)*2 and it's sometimes completely different but unable to get the logic.
Looking for tips
All I have so far is (18!/(4!*6!*8!)+9!/2!*3!*4!+??)/36 but I am unsure of what I need to replace the ?? with.
I've seen that it's sometimes replaced with (n/2)! and sometimes (n/2)*(n/2)! + (n/2)*(n/2)*2 and it's sometimes completely different but unable to get the logic.
Looking for tips