Count of characters which doesn't change in palindrome.
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Minimum number of characters to be replaced to make a given ... to make it palindrome by replacing minimum characters. ... Counting one change operation.
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A palindrome is a set of characters which equal the same thing forwards and backwards, for example; abccba.
For a set of a given amount of characters (we can use 9 as an example) how would you calculate the amount of palindromes of characters mathematically?
This doesn't mean the words that can be formed but rather characters which are the same at start characters and end characters.
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