There are 5 different pictures. We want to hange them on a wall. If we want a special one to be in the middle in how many ways we can hang them?

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- Feb 18th 2013, 07:01 AMkastamonupermutation
There are 5 different pictures. We want to hange them on a wall. If we want a special one to be in the middle in how many ways we can hang them?

- Feb 18th 2013, 07:20 AMPlatoRe: permutation
- Feb 18th 2013, 08:33 AMMINOANMANRe: permutation
Kastamonu

this an easy question . If one photo is your favourite then pick-it up and fix the remaining 4....you have as many choices as the permutations for 4 photos are. i.e 4!...easy.... - Feb 18th 2013, 08:38 AMPlatoRe: permutation
- Feb 18th 2013, 09:14 AMkastamonuRe: permutation
I did the samething but according to my book the answer is 48. 2 pictures from 4 can be chosen in 1/2p(4,2)=6 ways. they change places between themselves and this is 2! and this öakes 12. The other 2 pictures change places between themselves 2!. 12.2! is 24. If we think 4 pictures as 2 seperate groups : 24.2!=48.

- Feb 18th 2013, 10:33 AMPlatoRe: permutation