For the group of 3 digit numbers :
Any number from 1-9 can be the 1st digit, any number from 0-9 can be the 2nd digit, the 3rd digit can only be one number that matches the 1st digit.
The number of possibilities is thus, 9 x 10 x 1 = 90.
For the group of 4 digits :
Any number from 1-9 can be the 1st digit, any number from 0-9 can be the second digit, the 3rd digit can only be the one number that matches the 2nd number, and the 4th digit can only be the one number that matches the 1st digit.
Number of possibilities is 9 x 10 x 1 x 1 = 90.
Giving a total of 180 palindromic numbers between 100 and 10000.
There are 100 palindromes between 10,000 and 20,000.
350
there are 90 palindromes in 100 to 1000 As; 10 palindromes in each 100 and upto 1000, there are 9 hundreds.Therefore; 9 into 10 is equal to 90
10 - 101,111,121, ...
40.
There are 100 palindromes between 10,000 and 20,000.
350
there are 90 palindromes in 100 to 1000 As; 10 palindromes in each 100 and upto 1000, there are 9 hundreds.Therefore; 9 into 10 is equal to 90
25 numbers are between 1-100.
10 - 101,111,121, ...
40.
40 palindromes.
18 if you include 1 and 17 if you do not.
There are ten such numbers.
6.
10
90