Search found 15 matches

by amber g.
Sat Jul 14, 2018 4:51 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

I have put some comments about IMO in BRF math dhaga.
by amber g.
Sun Jul 08, 2018 10:54 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

The International Math Olympiads 2018 are currently in process. Good luck to Alll, specially Indian and US teams. US Team: - James Lin (Contestant 1)(19 years old, Gold in IMO 2017) • Participation at IMO: 2017 (G) - Adam Ardeishar (Contestant 2)(16 years old) - Mihir Anand Singhal (Contestant 3)(17...
by amber g.
Thu May 31, 2018 2:50 am
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

Just saw this thread - Few comments - (Odd to see not much discussion - if there is interest will add more) The first two problems have been asked (and discussed - in quite detail) in BRF dhaga. I first heard a problem similar to problem 2 in a scientific magazine about 50 years ago, and to my know...
by amber g.
Thu May 31, 2018 2:13 am
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

Hope some people are interested .. few comments on all the "undiscussed" problems posted here before.. Dragon Problem Apart from wiki page -This problem has appeared in various forms in many places.. teaches some nice tools in Math/Physics so it has also been a home-work problem in some colleges. (H...
by amber g.
Wed May 30, 2018 11:57 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

MehtaRahulC wrote:
Wed May 30, 2018 1:48 am

when hats have seven colors, form 001 to 111 , use bitwise xor ..
And what do you do when result is "000" hannji : ) ( Colors are from B'001 to B'111" -- there is no color = b'000')
(As with your previous problem xoring works only for 2 (or 4, or 8 etc) colors.
by amber g.
Wed May 30, 2018 10:01 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

^^^T he answer I was thinking is unbelievably simple!!! All you have to know is how to add and subtract.. and very simple logic!!! (specially knowing mod method just shown above) Let the hats choices be (1,2,...M) and the first person, instead of guessing simply shouts out loud the sum (of the rest ...
by amber g.
Tue May 29, 2018 11:30 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

^^^ Still very few comments... Believe it or not, for any given value of M, and N where N= Number of prisoners and M= choice of hat colors, the answer is simple and surprising if you have not heard it before. (And it may not depend on the jailor knowing your strategy :)). Generally the question is a...
by amber g.
Sun May 27, 2018 3:03 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

^^^ Okay, I just thought of modifying the above problem:
What if the choice of color of hat is not only "RED" and "WHITE".. the choice is 7 colors (all rainbow).
Hint1: Problem is VERY simple if one thinks in the right direction.
Hint2: Really, the above hint ought to be enough :).
by amber g.
Sun May 27, 2018 6:53 am
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

A prison warden calls 25 prisoners and tells them (1) Tomorrow , I will make all of you stand in a one line in any order I decide (2) Then I will put a RED hat or WHITE hat on top of each of your head in any order I decide (3) Each one can see hats in FRONT of him, but NOT his own hat and NOT had o...
by amber g.
Sun May 27, 2018 6:51 am
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

Thanks. Nice problem it also introduces useful application of modulo math. The solution will work not only for 4 hats but any number of hats say N >1. First each prisoner, as is customary in any Indian film, ought to be known by number ' 0 to (N-1)' Now All Kaidi number 'n' does : sum up all the "n...
by amber g.
Sat May 26, 2018 3:20 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

Are people visiting or interested in this thread?
by amber g.
Fri May 25, 2018 6:09 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

Minor corrections to post I posted before .. looks like I can not edit the post ... Just saw this thread - Few comments - (Odd to see not much discussion - if there is interest will add more) The first two problems have been asked (and discussed - in quite detail) in BRF dhaga. I first heard a probl...
by amber g.
Fri May 25, 2018 5:40 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

^^^ The above makes a much cuter problem - I may use it in one of the competition.. 10 Prisoners - call them K-10, K-11, K-12, ...... K-19... Their hats similarly numbered (10,11,12,.....19) ityadi ityadi ... Now solution for even a first grader.. Sum up all the numbers (do not worry about carry ove...
by amber g.
Fri May 25, 2018 5:26 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

This puzzle isnt related to politics etc The game has Warden and 4 prisoners A, B, C and D Warden will put any one number between 0 to 3 on hats of all 4 prisoners A to D repetitions are allowed eg Warden may put (0,1,1,2) Each can see number of other three and not his own Each has to write a numbe...
by amber g.
Fri May 25, 2018 5:05 pm
Forum: Archive
Topic: Maths puzzles
Replies: 21
Views: 44359

Re: Maths puzzles

Just saw this thread - Few comments - (Odd to see not much discussion - if there is interest will add more) The first two problems have been asked (and discussed - in quite detail) in BRF dhaga. I first heard a problem similar to problem 2 in a scientific magazine about 50 years ago, and to my knowl...