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Topic review (newest first)

jacks
2013-01-20 17:58:35

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

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