Algebra, Geometry, International Mathematical Olympiads, Recreational Mathematics, Math contests, Puzzles, Brainteasers, Number Theory, Combinatorics, Logic, Paradox
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Algebra, Geometry, International Mathematical Olympiads, Recreational Mathematics, Math contests, Puzzles, Brainteasers, Number Theory, Combinatorics, Logic, Paradox
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https://www.quora.com/A-ten-digit-number-is-said-to-give-interesting-integers-if-its-digits-are-all-distinct-it-is-a-multiple-of-11-111-How-many-such-integers-are-there