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Q: How many ten digit palindromes are there?

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Five of them.

There are 90 four-digit palindromes

There is 90 four digit palindromes.

There are no four-digit perfect squares that are palindromes.

There are 900 6-digit palindromes.

There are 10 3-digit odd palindromes that are divisible by five.

90 of them.

90

9 of them.

For there to be palindromes, each digit must be replicated. Therefore there are at most three distinct digits.If there are 3 pairs of different digits, then there are 6 palindromes. If there can be more duplicate digits, then there are 27 palindromes.

8

90

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