permutation and combination

Asked by Kirandoon | 9th Nov, 2008, 08:15: PM

Expert Answer:

If there was no restriction , they could sit in 5 ! ways .

(i)  If x and y have to sit together , then treat x and y as 1 person. and the two can interchange places , so 2! x 4! ways

 

(ii)  Total ways - ways in which x and y are together =  5 ! - 2!  x 4!  ways

Answered by  | 10th Nov, 2008, 09:34: AM

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