SOLUTION: A number that is a palindrome reads the same foward and backward. 90 three-digit palindromes and 90 four-digit palindromes exist. How many five-digit palindromes exist?
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Question 129898: A number that is a palindrome reads the same foward and backward. 90 three-digit palindromes and 90 four-digit palindromes exist. How many five-digit palindromes exist? Answer by scott8148(6628) (Show Source):
You can put this solution on YOUR website! for each of the 90 four-digit palindromes, any one of ten digits can be inserted in the center,
__ forming a five-digit palindrome
90 four-digit palindromes using 10 center digits gives 900 five-digit palindromes
