There are 20 people among whom two are sisters. Find the number of ways in which we can arrange them around a circle so that there is exactly one person between the two sisters.
Answers
Answered by
0
This is ur answer hope it will help u in case of any doubt comment below
Attachments:
Answered by
5
ANSWER
.......
2*18*17*1/2
2!=2*1=2
cancelling 2and (1/2) leaves 18*17! which is 18! ways
Total cases (19!)/2
therefore the probability is
(18!)/((19!)/2) = (2*(18!))/(19*(18!)) = 2/19
.......
2*18*17*1/2
2!=2*1=2
cancelling 2and (1/2) leaves 18*17! which is 18! ways
Total cases (19!)/2
therefore the probability is
(18!)/((19!)/2) = (2*(18!))/(19*(18!)) = 2/19
Similar questions