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 Discussion Response Post to:
P n C
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 14 May 2008 20:16:54 IST
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7C3 X 4!
First you choose 3 periods for the lecturers to deliver the lecture.. These three will be filled in the order A before B before C. So now permutations of this. Now you have 4 remaining periods.. These can be shared in any order by the 4 other teachers. Number of ways is 4!..
So Answer is 7!/3! =840
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