How Many Four Digit Palindromic Numbers Are There?


There are ninety four digit palindromic numbers in existence. Interestingly enough, this is the same number of three digit palindromic numbers that exist, as the second digit is the same as the third digit in a four digit palindromic number.
Q&A Related to "How Many Four Digit Palindromic Numbers Are..."
There are 90 such numbers.
Among the 900 5 digit palindromes, 93 are prime. Among the 9000.
Its a trivial problem, honestly. The answer is 10P4 = 5040. Since only the first four digits of the seven digit number matter. The remaining (last) three are reflections of what the
Permutations . . . (4 x 3 x 2 x 1) = 24 of them. Combonations . . . only 1 of them.
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