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To be a 3 digit palindromic number, it must be of the form aba.
I assume that a 3 digit number must be at least 100 (so that 020 for example does not count as a 3 digit number):
- a can be any of the nine digits 1-9;
- for each of these b can be any of the ten digits 0-9
Thus there are 9 x 10 = 90 three digit palindromic numbers.
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How many odd palindromic numbers are their between the numbers 246 and 642?
Twenty.
How many 8 digit palindromic numbers are there?
a 8-digits palindromic number is a number consisting of a 4-digits number written and then written backward, i.e. 1234 4321 so there are as many palindromic 8-digits numbers as 4-digits numbers so from 1000 to 9999, so there are 8999 palindromic 8 digits number (I assumed that 00011000 is not to be considered as a valid 8 digit number)
What trio of 3digit numbers have a sum of 801?
266, 267, 268
How many palindromic numbers are there between 0 and 100?
There are 9 palindromic numbers between 0 and 100: 11, 22, 33, 44, 55, 66, 77, 88 and 99.
How many palindromic numbers are there between 400 and 500?
There are 9 palindromic numbers between 400 and 500. A palindromic number reads the same forwards and backwards. The palindromic numbers in this range are 404, 414, 424, 434, 444, 454, 464, 474, and 484.
