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Mathematics 12 Online
OpenStudy (anonymous):

Della bought a custom charm bracelet with eight charms. If the bracelet has no clasp, in how many ways can she arrange the charms on the bracelet? please show your work.

OpenStudy (anonymous):

64? 8 times 8....

OpenStudy (zzr0ck3r):

well we can rearange 3 things like this a,b,c a,c,b c,a,b c,b,a b,a,c b,c,a this is 6 we had three things so 3! = 3*2 = 6

OpenStudy (zzr0ck3r):

similarly we can arrange 4 items 4! =24 ways

OpenStudy (anonymous):

Yes ... but the bracelet has no clasp

OpenStudy (zzr0ck3r):

what does that have to do with anything?

OpenStudy (anonymous):

It means that a b c c a b b c a are all the same arrangement

OpenStudy (zzr0ck3r):

ahhh

OpenStudy (anonymous):

you can just turn the bracelet, because there is no clasp to define any orientation of it

OpenStudy (zzr0ck3r):

well looking at my first example of 3 items that would get rid of all but three options

OpenStudy (anonymous):

it works out to two a c b c b a b a c is the other

OpenStudy (anonymous):

So you can start with the factorial, but then you need to divide by the number of charms to allow for all the positions you can turn the bracelet to

OpenStudy (zzr0ck3r):

what class is this for? Discreet?

OpenStudy (anonymous):

And it goes further than that ... because you could slip the bracelet on either way, I guess

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