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90000.

With 10 digit palindromes, the last 5 digits are the same as the first 5 digits in reverse, eg 12345 54321. So it comes down to how many 5 digit numbers are there?

They are the numbers "10000" to "99999", a total of 99999 - 10000 + 1 = 90000.

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โˆ™ 2011-10-22 19:49:45
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Q: How many ten digit palindromes are there?
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