sutharpralhad wrote:
Bunuel wrote:
arunraj wrote:
A group of 5 students bought movie tickets in one row next to each other. If Bob and Lisa are in this group, what is the number of ways of seating if both of them will sit next to only one other student from the group?
A. 3! x 2!
B. 4! x 2!
C. 4!
D.3!
A. 3! x 2!
B. 4! x 2!
C. 4!
D.3!
The question basically asks about the # of ways that Bob and Lisa sit at the ends (only this way is valid so that both of them will sit next to only one other student).
Desired arrangement is eitherBXYZL orLXYZB . Now, XYZ can be arranged in 3! ways, therefore total # of favorable arrangements is 2*3!.
Answer:A.
Hi Bunuel ,
Kindly explain why Bob and lisa can sit at ends only . This Case XBYLZ will also meet the requirement of question that B&L will sit next to only one other student . I interpreted it as that they will not sit together.
Thanks
The phrase "both of them will sit next to only one other student from the group" means Bob and Lisa each should have only one neighboring student, not two.
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Statistics : Posted by Bunuel • on 01 Nov 2013, 23:54 • Replies 9 • Views 5960
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