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Number Theory
Level
3
How many \(4\) digit palindromes are divisible by \(7\)?
Details and assumptions
A palindrome is a number that is the same when its digits are reversed (i.e. \(232\) is a palindrome).
The number \(10=010\) is not considered a 3-digit palindrome. It only has 2 digits, and we ignore any 0's at the start.
by
Calvin Lin