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      08-02-2010, 03:07 PM   #24
Freakazoid
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Quote:
Originally Posted by schoy View Post
Simple solution:

Probability that Bob takes one of the ends: 2 out of 5 seats (2/5)
Probability that Lisa takes the other end: 1 out of the remaining 4 seats (1/4)

2/5 x 1/4 = 2/20 = 1/10

QED

Edit: BTW, as you can tell by the calculation, OP is misreading the question. In order to sit next to only one other person, Bob and Lisa must necessarily sit at the ends.
schoy, you are correct.

Bob and Lisa are both students, so both count in terms of 'sitting next to one student'.