Q: Who invented palindromes?

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121

48 palindromes.

Forty palindromes.

99 palindromes.

189 palindromes.

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Since there are no palindromes, the question cannot be answered.Since there are no palindromes, the question cannot be answered.Since there are no palindromes, the question cannot be answered.Since there are no palindromes, the question cannot be answered.

Palindromes.

121

There are 90 four-digit palindromes

48 palindromes.

Forty palindromes.

99 palindromes.

189 palindromes.

40 palindromes.

198 palindromes.

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.

There are 900 6-digit palindromes.