How many three-digit palendromes exist? For ex. 171 is three digit palendrome.
2006-10-11 13:45:09 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
1(0-9)1 = 10 numbers
2(0-9)2 = 10 numbers
...
8(0-9)8 = 10 numbers
9(0-9)9 = 10 numbers
assuming you can use 3 identical numbers, then
ANS : 90
assuming you can't use 3 identical numbers, then
ANS : 81
2006-10-11 17:18:20 · answer #1 · answered by Sherman81 6 · 0⤊ 0⤋
Think about it this way, it has to be in the form of ABA where A is from 1-9 and B is 0-9 So that's 9*10, or 90.
If 010, 020, etc are included that would be 10*10, or 100.
2006-10-11 20:55:54 · answer #2 · answered by Charlie 2 · 0⤊ 0⤋
Palendromes are words so one seven one isn't a 3 digit palendrome.
wow
bob
pop
tot
2006-10-11 20:54:21 · answer #3 · answered by lazerustheduck 1 · 0⤊ 0⤋
interesting.....didn't think palindromes could be numbers.
2006-10-11 20:54:01 · answer #4 · answered by lethallolita 3 · 0⤊ 0⤋