25-42 ■ Probability These exercises involve probability.
Zip Codes In the postal code system, zip codes consist of nine digits.
(a) How many different codes are possible?
(b) How many different codes are palindromes? (A palindrome is a number that reads the same from left to right as right to left.)
(c) What is the probability that a randomly chosen code is a palindrome?
The number of different codes that are possible.
Codes consist of digits. digits. since, there is no restriction. So there are choices for the all the digit. Hence, the total number of codes that are possible is given is
The number of different codes that are palindrome.
The probability that a randomly chosen code is a palindrome.
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