Money Palindromes Answer
During my last visit to the grocery store, I paid $13.31 — a palindrome centered on the period. What is the probability of having to pay an amount that is a palindrome centered on the period? Mohammad Rasoulipour gave the following answer: “There is only a possibility of palindromes centered on a period on the amounts less than $100 because it has to fit in the general symmetrical shape of XY.YX. X could be any of 10 digits and Y could be any of 10 digits so: 10X10X1X1 = 100. It starts with 01.10 (also seen as 1.1) since 00.00 is considered free, and it extends to 99.99 there are 99 possible in 10,000 (10X10X10X10). So the probability is 99/10,000 or 0.0099.” Jim Miller also provided a good solution. Mohammad, stop by SC 117 for your prize.