No. of permutation of n- different things takenat a time when perticular things is to be always included in each arrangement is
answer Given is
My solution:: Hereperticular objects are always included So we arrange objects out of total objects
Which can be done in
Now arrangeperticular objects which can be done in ways
Now arrangeobjects Simultaneously which can be done by ways.
My Doubt is why answer is given only
Last edited by jacks (2013-01-19 19:13:07)