WC 5.1 Palindrome Probability

What is the probability that a randomly drawn n-digit number is a palindrome?

For example, for a 1 digit number(n=1), every number is a palindrome. Thus probability of a palindrome is 10/10 which is reducible to 1/1. For a 2 digit number, 11, 22,..99 are palindromes. There are thus 9/90 palindromes (reduced fraction: 1/10).


Find the probability of a 10-digit palindrome. Reduce this fraction to the lowest terms and state your answer to be the product of numerator and denominator.

This challenge is worth 60 points.

You must be logged in to submit a solution

View ranklist for this challenge
About scoring and submission

Contact Us


Krish Shah : 9323115454

Kaustubh Khavnekar : 9769408039



Privacy Policy