A palindrome is a number that reads the same forward and backward, such as 171. How many even, 6-digit numbers are palindromes?
Choose one:
A) 405
B) 450
C) 400
D) 900
E) 2500
First recognize you only need to consider the first three digits (because the second three are just the first three flipped)   There are 900 possibilities for the first three digits of a 6 digit number, 100-999 inclusive. Everything starting with a 2,4,6,8 will be even, which is 4/9ths of the combinations.   4/9*900= 
<gadget id="calculator">4/9*900</gadget>
<output>400</output>
400   ANSWER:400
<result>C</result>
A palindrome is a number that reads the same forward and backward, such as 171. How many even, 6-digit numbers are palindromes?