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wu :: forums    riddles    easy (Moderators: william wu, Eigenray, ThudnBlunder, Icarus, towr, SMQ, Grimbal)    Number sequence « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: Number sequence  (Read 712 times) Thomson Guest Number sequence   « on: Jan 13th, 2005, 2:08pm » Quote Modify Remove What is the missing value in the following sequence?   2616, 3, 11, 10850, _____, 25, 2038   IP Logged ThudnBlunder wu::riddles Moderator Uberpuzzler The dewdrop slides into the shining Sea     Gender: Posts: 4489 Re: Number sequence   « Reply #1 on: Jan 13th, 2005, 10:27pm » Quote Modify Is it Easy? IP Logged THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you. Thomson Guest Re: Number sequence   « Reply #2 on: Jan 14th, 2005, 4:29pm » Quote Modify Remove Easy-ish. But it's always like that when you have the answer. -_-   I'm not sure, maybe it could be medium or hard. IP Logged puzzlecracker Senior Riddler Men have become the tools of their tools     Gender: Posts: 319 Re: Number sequence   « Reply #3 on: Jan 14th, 2005, 6:42pm » Quote Modify this problem doesnt have an answer... he just made it up.  be serious please. IP Logged While we are postponing, life speeds by ThudnBlunder wu::riddles Moderator Uberpuzzler The dewdrop slides into the shining Sea     Gender: Posts: 4489 Re: Number sequence   « Reply #4 on: Jan 14th, 2005, 9:25pm » Quote Modify on Jan 14th, 2005, 6:42pm, puzzlecracker wrote: this problem doesnt have an answer... he just made it up.   So we can just make up an appropriate polynomial to fit the data and find the missing 'value'. IP Logged THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you. puzzlecracker Senior Riddler Men have become the tools of their tools     Gender: Posts: 319 Re: Number sequence   « Reply #5 on: Jan 14th, 2005, 9:49pm » Quote Modify can you really do that?  although the probability is definitely on your side, for he seem not to use primarily prime numbers.. but that interesting IP Logged While we are postponing, life speeds by TenaliRaman Uberpuzzler I am no special. I am only passionately curious.     Gender: Posts: 1001 Re: Number sequence   « Reply #6 on: Jan 15th, 2005, 1:12am » Quote Modify on Jan 14th, 2005, 9:49pm, puzzlecracker wrote: can you really do that?  although the probability is definitely on your side, for he seem not to use primarily prime numbers.. but that interesting   Yes definitely. Simply construct the difference table to find the missing value. For finding the polynomial, one can use the Newton's Interpolation Formula. IP Logged Self discovery comes when a man measures himself against an obstacle - Antoine de Saint Exupery rmsgrey Uberpuzzler     Gender: Posts: 2873 Re: Number sequence   « Reply #7 on: Jan 15th, 2005, 9:00am » Quote Modify Giving P(xi) for N distinct xi always defines precisely one polynomial P(x) of degree N-1 or less. You get N equations in N unknowns (the coeffecients of the polynomial), and requiring the xi to be distinct guarantees non-degeneracy. 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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