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#1 2013-01-19 18:58:35

jacks
Member
Registered: 2012-11-21
Posts: 80

Permutations

No. of permutation of n- different things taken

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

answer Given is



My solution:: Here

perticular objects are always included So we arrange
objects out of total
objects

Which can be done in

Now arrange

perticular objects which can be done in
ways

Now 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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