A palindrome is a number that reads the same forward and backward, such as 343.
A palindrome is a number that reads the same forward and backward, such as 343. How many odd, 8-digit numbers are palindromes?
Answer/Solution
5000
Steps/Work
First recognize you only need to consider the first four digits (because the second four are just the first four flipped)
There are 9000 possibilities for the first four digits of a 8 digit number, 1000-9999 inclusive. Everything starting with a 1,3,5,7,9 will be odd, which is 5/9ths of the combinations.
5/9*9000 = 5000
ANSWER:D
There are 9000 possibilities for the first four digits of a 8 digit number, 1000-9999 inclusive. Everything starting with a 1,3,5,7,9 will be odd, which is 5/9ths of the combinations.
5/9*9000 = 5000
ANSWER:D