BOOB, DEED, NOON, POOP, SEES and TOOT are some examples.
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There are 90 four-digit palindromes
A palindrome is a word that reads the same left-right and right-left. e.g. noon, toot, peep, etc. Many 4-letter palindromes will have a double 'o' or double 'e' in the middle, but they can be different. e.g. otto, ABBA, etc.
There are 90 such numbers.
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.
1, -4, 92, 0, and 38.