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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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There are 900 six-digit palindromes.

Q: How many different palindromes are there with 6 digits?

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If the 6 digits can be repeated, there are 1296 different combinations. If you cannot repeat digits in the combination there are 360 different combinations. * * * * * No. That is the number of PERMUTATIONS, not COMBINATIONS. If you have 6 different digits, you can make only 15 4-digit combinations from them.

6 of them.

Some 6 letter palindromes you may like:RedderHannah

987,654

6 if all digits are different, 27 otherwise.

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There are 900 6-digit palindromes.

6.

If the 6 digits can be repeated, there are 1296 different combinations. If you cannot repeat digits in the combination there are 360 different combinations. * * * * * No. That is the number of PERMUTATIONS, not COMBINATIONS. If you have 6 different digits, you can make only 15 4-digit combinations from them.

6 digits

6 of them.

6 of them. 4C2 = 4!/(2!*2!) = 4*3/(2*1) = 6

Some 6 letter palindromes you may like:RedderHannah

64 or 123

6 if all digits are different, 27 otherwise.

987,654

There are 400. Assuming the number must be at least 10,000, then: In a 5 digit palindrome, the first and last digits must be the same, and the second and fourth digits must be the same; and: For the first and last digit there is a choice of 4 digits {2, 4, 6, 8}; For each of these there is a choice of 10 digits {0, 1, ..., 9} for the second and fourth digits; For each of the above choices these is a choice of 10 digits {0, 1, ..., 9} for the third digit; Making 4 x 10 x 10 = 400 possible even 5 digit palindromes.

6 digits