Study homework help

This maths question is really bugging me. In my Active Maths Book 1 pg 116 question 13, there is a question on palindromic numbers. I understand the term palindromic and got my first answer to part (i) which asked me the amount of 3 digit palindromic number ...my answer is 90 ...now it asks me to find the number of palindromic numbers between 10 to the power of 6 and 10 to the power of 7. I know from the back of the book that the answer is supposed to be 9000 but when i try the question i get a different answer. Andyone know how to do it?

michaels— 31/08/16