There are two rows ,one behind other, of 5
chairs each . Five couples are to be seated ,
number of arrangements such that no
husband sits in front of or behind his wife
(a) 120x44 (b) 10C5x120x44 C)10C5 x 44(d) 44

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@oldrin.bataku @mathslover

http://www.wolframalpha.com/input/?i=derangement+5

haha,i was thinking of applying the dearrangement formula itself!

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