30 palindromes.
The answer is 400-100-1 = 299 (excluding both 100 and 400).
350 to 449 -- 100 numbers
350 to 449 -- 100 numbers
300.
500
59
-200
40. There are 400 numbers between 100 and 500 and one in every ten ends in 5.
138 of them.
30 of them.
299
57