Question: (a) For the ship in Example 9.28, how many signals use at least one flag of each color? (Solve this with an exponential generating function.)

(a) For the ship in Example 9.28, how many signals use at least one flag of each color? (Solve this with an exponential generating function.)
(b) Restate part (a) in an alternative way that uses the concept of an onto function.
(c) How many signals are there in Example 9.28, where the total number of blue and black flags is even?

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