palindromes using 5 diff. letters under conditions
Source: Dutch NMO 2006 p1
September 21, 2019
number theorypalindromes
Problem Statement
A palindrome is a word that doesn't matter if you read it from left to right or from right to left. Examples: OMO, lepel and parterretrap.
How many palindromes can you make with the five letters and under the conditions:
- each letter may appear no more than twice in each palindrome,
- the length of each palindrome is at least letters.
(Any possible combination of letters is considered a word.)