Question
Mon June 04, 2012 By: Pragyajha

there are 6 students a,b,c,d,e,f.

Expert Reply
Mon June 04, 2012
Total number of arrangment = 6! = 720
Consider c and d to be a single letter then
The number of ways in which c and d are together = 4!2!= 48
 
Hence, number of ways in which c and d are not together = 720 - 48 = 672.
Home Work Help