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**jacks****Member**- Registered: 2012-11-21
- Posts: 128

No. of permutation of n- different things taken

at a time when perticular things is to be always included in each arrangement isanswer Given is

My solution:: Here

perticular objects are always included So we arrange objects out of total objectsWhich can be done in

Now arrange

perticular objects which can be done in waysNow arrange

objects Simultaneously which can be done by ways.My Doubt is why answer is given only

Thanks

*Last edited by jacks (2013-01-19 19:13:07)*

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