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Q: How many four digit palindromes are there?

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There are 90 four-digit palindromes

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

There are 90 four-digit palindromes

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There are 900 6-digit palindromes.

Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.

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

90

90 of them.

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.

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