The probability of choosing a four digit number is exactly the palindrome number For example, 1111122113312552

The probability of choosing a four digit number is exactly the palindrome number For example, 1111122113312552

When the thousand digit and the individual digit are 1, the ten digit and the hundred digit are 0 and 1 At 9:00, there are 10 replies
Similarly, thousand bits and individual bits are 2, 3 There are 10 palindromes at 9:00
Therefore, there are 9000 four digit numbers, including 1000-9999, of which 90 are palindromes. Therefore, the probability that choosing any four digit number is exactly palindromes is 90 / 9000 = 1 / 100