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Jumping Kangaroos - Futility Closet

Summary by Futility Closet
A puzzle by National Security Agency mathematician David B., from the agency’s October 2017 Puzzle Periodical: Joey, the baby kangaroo has been kidnapped and placed at 2100 on a number line. His mother, Kandice the Kangaroo, is at 0 on the number line, and will try to save him. Kandice normally jumps forward 6 units at a time. Guards have been placed at n3 on the number line, for every integer n≥1. If Kandice lands on a number with a guard on it…
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Futility Closet broke the news in on Friday, July 18, 2025.
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