How many 9-digits number are Palindromic numbers? A Palindromic number reads the same forward and backward, example 123454321.  Choices
A) 100	B) 610	C) 729	D) 900	E) 90000
Take the task of building palindromes and break it intostages.   Stage 1: Select the 9th digit   We can choose 1, 2, 3, 4, 5, 6, 7, 8, or 9   So, we can complete stage 1 in9ways   Stage 2: Select the 8th, 7th, 6th, 5th digit   We can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9   So, we can complete stage 2 in10ways   IMPORTANT: At this point, the remaining digits are alreadylocked in.   Stage 3: Select the 4th, 3rd, 2nd, 1st digit   So, we can complete this stage in1way.   By theFundamental Counting Principle(FCP), we can complete all 5 stages (and thus build a 9-digit palindrome) in(9)(10)(10)(10)(10)(1)(1)(1)(1)ways (= 90000 ways)   Answer: 90000
<result>E</result>
How many 9-digits number are Palindromic numbers? A Palindromic number reads the same forward and backward, example 123454321.