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c 3 points let dn be the number of ways...

Question: c 3 points let dn be the number of ways...

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(c) (3 points) Let D(n) be the number of ways to put n dominoes on a 2 × n grid. (see picture for 2 different ways of putting 10 dominoes in a 2 × 10 grid.) Find a recurrence for D(n) and explain in words why D(n) satisfies this recurrence.

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