How many palindrome are there?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A palindrome is a sequence of 9 numbers that read identically from left to right and from right to left.  For example, 555555555 and 123454321 are palindromes but 123456789 is not. How many palindrome are there? 

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