A certain ice cream store has 31 flavors of ice cream available. In how many ways can

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A certain ice cream store has 31 flavors of ice cream available. In how many ways can we order a dozen ice cream cones if
(a) We do not want the same flavor more than once?
(b) A flavor may be ordered as many as 12 times?
(c) A flavor may be ordered no more than 11 times?
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