Question 1:  How many ways can they line up so there is always atleast 1 duck between any two geese.

Advanced Engineering Mathematics
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ISBN:9780470458365
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Chapter2: Second-order Linear Odes
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Discrete Math:

Lets say there are 10 ducks and 6 geese that are lined up in a single row.


Question 1:  How many ways can they line up so there is always atleast 1 duck between any two geese.

Question 2: How many manys can they line up so that every goose stands next to one other goose.

 

 

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