HMMT 2006 E10
- General 1
- Answer
A positive integer is called "flippant" if does not end in 0 (when written in decimal notation) and, moreover, and the number obtained by reversing the digits of are both divisible by 7 . How many flippant integers are there between 10 and 1000 ?
Dataset text NuminaMath olympiads. Quoted with source.
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