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

Asked by PRAGYAJHA | 4th Jun, 2012, 12:31: PM

Expert Answer:

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.

Answered by  | 4th Jun, 2012, 06:01: PM

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