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Bunch of problems like this are in the book "Problem-Solving Strategies" by Arthur Engel [1], I believe even including this particular one. Fun book. [1]https:
by strstr 5y ago
Bunch of problems like this are in the book "Problem-Solving Strategies" by Arthur Engel [1], I believe even including this particular one. Fun book.
[1]https://www.google.com/books/edition/Problem_Solving_Strategies/IJLzBwAAQBAJ?hl=en&gbpv=0 https://www.google.com/books/edition/Problem_Solving_Strateg...
- rodneyzeng 5y agoYeah, got this book and the problem was also a classical one.
- taeric 5y agoOr anything with Martin Gardner's name on it. All worth reading.
- romaththrow592 5y agoThis book is a classic one for kids participating in math competitions in Romania. I once had to solve a variation of this problem at a math contest when I was in 6th grade.