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Probability
Level
1
A palindrome is a number that reads the same forwards as it does backwards. For example, 98789 is a 5-digit palindrome, and 7337 is a 4-digit palindrome. How many 3-digit palindromes are there?
The answer is 90.
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1 solution
From 100 to 199, there are 10 palindromes (101, 111, 121, 131, 141, 151, 161, 171, 181 and 191). We also know that there are 9 hundreds below 1000. Multiplying: 10 *9 = 90 palindromes.