a a palindrome is a word that reads, Mathematics

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a a palindrome is a word that reads

a) A palindrome is a word that reads the similar whether read from right to left or from the left to right, the word ROTOR, for example. Let be the number of words of length n, not necessarily meaningful, which are palindromes. We have a single letter as a palindrome.

i) What are a₁ and a₂?

ii) Set up a recurrence for a_n .

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