I copied the question from a "maths competition" paper. I did it the same way as you, though didn't bother with squares like 169, since 196 is the same digits...
15040
MorphemeAddict
lojbaner
Sep 2, 2011 3:18 am
I don't know whether this is right or wrong or neither, but it's too much work to read it. stevo ... [Non-text portions of this message have been removed]...
15041
Darrell Plank
darrellplank
Sep 2, 2011 2:59 pm
It’s a good example of the Einstellung effect (http://en.wikipedia.org/wiki/Einstellung_effect). From: PhilM4@... Sent: Wednesday, August 31, 2011 3:59...
15042
Ian Jones
travis_38uk
Sep 2, 2011 10:09 pm
Correcto Stevo - I did like the "bing bang" bit though ;o)  Ian ... From: MorphemeAddict <lytlesw@...> Subject: Re: [MATH for FUN] Re: QUESTIONS...
15043
Tofique Fatehi
tofiquef
Sep 3, 2011 3:00 pm
Without using trigonometry, using just geometry and arithmetic, solve this - apparently simple - puzzle. ABC is an isoceles triangle, with the apex angle...
15046
MorphemeAddict
lojbaner
Sep 4, 2011 5:02 am
80 degrees. stevo ... [Non-text portions of this message have been removed]...
15047
Tofique Fatehi
tofiquef
Sep 4, 2011 1:11 pm
Way off. Did you measure it with a protracter? Tofique ... From: MorphemeAddict <lytlesw@...> Subject: Re: [MATH for FUN] No trigonometry please To:...
15048
video_ranger
Sep 4, 2011 8:38 pm
I think the angle is 20 degrees and can prove it but only using numerous trig identities so far. It's a good problem. Mark...
15049
MorphemeAddict
lojbaner
Sep 5, 2011 2:06 am
I didn't measure anything. I just started with the given angles and calculated the unknown ones. I may have made some mistakes along the way. stevo ... ...
15050
bogaduck
Sep 5, 2011 1:13 pm
I used this method but got 40 degrees....
15051
Tofique Fatehi
tofiquef
Sep 5, 2011 2:54 pm
The subject clearly says NO TRIGONOMETRY 20 ? 40 ?? 80 ??? Â I am as confused amd without a solution as you all are. What apparently seems a simple puzzle is...
15052
skahmad
Sep 5, 2011 9:35 pm
More civil engineering problems inclucing indeterminate structures have been solved and uploaded by the problemsolver at ...
15053
ali darvish
ali_m_darvish
Sep 5, 2011 10:22 pm
________________________________ From: skahmad <skahmad@...> To: mathforfun@yahoogroups.com Sent: Monday, September 5, 2011 11:07 AM Subject: [MATH for...
15054
video_ranger
Sep 6, 2011 12:29 am
Here's a possible first step: Prove AE=BC. In other words solve the even simpler looking problem (without "trigonometry"): ...
15055
lavesh rawat
love19_foryou
Sep 6, 2011 1:19 pm
Good Riddle - 6 September At a local bar, three friends, Mr. Green, Mr. Red and Mr. Blue, were having a drink. One man was wearing a red suit; one a green...
15056
MorphemeAddict
lojbaner
Sep 6, 2011 6:09 pm
Since Mr. Red answers the man in blue, Red is not blue, hence he is green. Since Blue isn't wearing blue, he's wearing red, leaving Green in blue. Green - blue...
15057
lavesh rawat
love19_foryou
Sep 7, 2011 1:55 pm
Simple Simple Google Interview Puzzle  - 7 September The puzzle is if the shopkeeper can only place the weights in one side of the common balance. For example...
15058
Tofique Fatehi
tofiquef
Sep 7, 2011 2:09 pm
1, 2, 4, 8, 16, 32, 64, 128, 256 and 512 Â Tofique Fatehi ... From: lavesh rawat <love19_foryou@...> Subject: [MATH for FUN] [Daily Brain Teasers ]...
15059
video_ranger
Sep 7, 2011 11:04 pm
I'm not exactly sure what "without trigonometry" means but I think the only things I use in the following proof are: (1) The sum of angles in a triangle is...
15060
lavesh rawat
love19_foryou
Sep 8, 2011 1:23 pm
(Google Interview 2nd Round) Weighing Balance Puzzle - 8 September You can place weights on both side of weighing balance and you need to measure all weights...
15061
MorphemeAddict
lojbaner
Sep 8, 2011 5:35 pm
Based on a recent thread here , I'm going to *guess* that it's 1, 3, 9, 27, 81, 243, 729, IOW, the powers of 3 up to 1000. stevo ... [Non-text portions of this...
15062
ramsey2879
Sep 9, 2011 11:55 am
Let A and B be two coprime integers. Find X = zero mod A such that Y = 2*X +1 = 0 mod B. Then 8*(Y + N*A*B)*(X + 2*N*A*B) + 1 is a square for all integer N. If...
15064
ramsey2879
Sep 10, 2011 11:40 am
... Sorry but I posted an incorrect clause. It should have been 8*(Y + 2*N*A*B)*(X+N*A*B) which reduces to (4(X+N*A*B)+1)^2 which is not very remarkable in it...
15065
bqllpd
Sep 11, 2011 2:33 am
Que pasa Alfredo? I think a good book you might want to read is, "Mathematics and the Imagination" by Edward Kasner. The book touches on some of the subjects...
15070
Kelly Bacon
snowplowdriv...
Sep 18, 2011 1:20 am
please take me off your email list! [Non-text portions of this message have been removed]...
15072
Alfredo Lopes
science2101
Sep 19, 2011 3:53 am
15073
lavesh rawat
love19_foryou
Sep 19, 2011 12:09 pm
Decode This Message - 19 September Decode The Message carrot fiasco nephew spring rabbit sonata tailor bureau legacy corona travel bikini object happen soften...
15075
Chris
fnetiks
Sep 22, 2011 3:32 pm
Hi group: I am brand new to the group, and hope that I can get some help with the following proof. My question is that if there is a shorter, simpler, and...
15076
video_ranger
Sep 22, 2011 8:42 pm
... Yes that's a good proof. Here's another way to see that the sum of n positive rational numbers must be unequal (in fact greater) than the sum of the...
15077
lavesh rawat
love19_foryou
Sep 23, 2011 12:21 pm
Google Interview Riddle  - 23 September How many times do a clock's hands overlap in a day ? Update Your Answers at : Click Here Solution Will be updated...
