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If Lisa and Sarah cannot sit next to each other in a row of

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Joined: 30 Aug 2003
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If Lisa and Sarah cannot sit next to each other in a row of [#permalink]  13 Mar 2004, 15:13
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If Lisa and Sarah cannot sit next to each other in a row of 6 chairs, in how many ways can Lisa and Sarah along with four other freinds be seated?

720
480
240
600
439
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Ans: 6! - 5! * 2! = 480

No restriction = 6! = 720
If two are sitting togather =5! * 2! = 240
If two are not sitting togather = 480
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