3-Digit Palindromes
Level
1
A palindromic number is one which can be written the same forward as backward.
Ex: 19391, 88388, 11, etc.
How many 3-digit palindromic numbers exist?
The answer is 90.
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1 solution
The first digit can be chosen in 9 ways (1 through 9).
The second digit can be chosen in 10 ways (0 through 9).
The last digit is determined by the first.
9 × 1 0 = 9 0