A sequence of letters of the form abcba, where the expression is unchanged upon reversing order, is
Question:
(a) If a letter may appear more than twice, how many palindromes of five letters are there? of six letters?
(b) Repeat part (a) under the condition that no letter appears more than twice.
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a For five letters there are 26 26 26 1 1 26s pal...View the full answer
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Related Book For 
Discrete and Combinatorial Mathematics An Applied Introduction
ISBN: 978-0201726343
5th edition
Authors: Ralph P. Grimaldi
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