Question: For an integer n > 0, let h, denote the number of n-digit integers such that both (i) only the digits 1, 3, 5 are

For an integer n > 0, let h, denote the number of n-digit integers such that both (i) only the digits 1, 3, 5 are used; (ii) each of the digits 1,3,5 is used an even number of times.

(i) Find ho, h1, h2, h3, h4, h5, h6.

(ii) Find hn in closed form.

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