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wu :: forums    riddles    hard (Moderators: towr, william wu, Icarus, ThudnBlunder, SMQ, Eigenray, Grimbal)    Infinite Quarter Sequence (Solution) « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: Infinite Quarter Sequence (Solution)  (Read 10150 times) kenny Newbie     Posts: 12 Infinite Quarter Sequence (Solution)   « on: Jul 30th, 2002, 12:40pm » Quote Modify I sorta figured this out by accident, but here's the solution.   First, all the coins are in pile A.  Move 20 coins to pile B.   If there are now N tails in pile A, there must be (20 - N) tails in pile B, and thus N heads in pile B.   Flip all coins in pile B.  There must now be N tails in pile B.   Done.   -- Ken IP Logged Marshall Guest Re: Infinite Quarter Sequence (Solution)   « Reply #1 on: Aug 9th, 2002, 11:43am » Quote Modify Remove I like it; nice job. IP Logged Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy   - medium => hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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