Question: (a) Find the exponential generating function for the number of ways to arrange n letters, n > 0, selected from each of the following words.

(a) Find the exponential generating function for the number of ways to arrange n letters, n > 0, selected from each of the following words.
i) HAWAII
ii) MISSISSIPPI
iii) ISOMORPHISM
(b) For section (ii) of part (a), what is the exponential generating function if the arrangement must contain at least two I's?

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