Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#55826 Re: Dark Discussions at Cafe Infinity » In response... » 2009-05-22 02:27:06

I knew you knew. It also covers some modern creatures like the chupacabra.

#55827 Re: Exercises » Pre-University Mathematics » 2009-05-21 11:32:35

Hi ganesh;

  These are pretty old so I won't hide them.

#1



n=8

#2 ignoring the trivial 0 and 1:
n=5

#9
By the binomial theorem:

If we say x=100 and y= -1 and we plug these into the RHS of the above identity. We get;



#10

#55828 Dark Discussions at Cafe Infinity » The end? » 2009-05-21 09:37:56

bobbym
Replies: 15

http://world.honda.com/ASIMO/

#55829 Re: Help Me ! » How To Figure Gross With a Certain Net Figure » 2009-05-21 09:14:47

Yep mathsyperson.

x = 551.11111...

So order 552 eggs

#55830 Re: This is Cool » Chutes and Ladders » 2009-05-21 09:01:33

Hi integer;

  I found that site too, see post #6, we think he is too high. Think that Mikau and the the guy from BYU (post # 4) are giving the correct answers.

  That kid sounds like me when I was 4. Very commendable.

#55831 Re: Exercises » Quittyqat's Exercises » 2009-05-21 08:40:42

Been there, can't find them.

#55833 Re: Jokes » Things to do in an elevator » 2009-05-21 08:29:14

I've got one! Enter. Go to the back. Face the front. Stare at the floor indicator. Do not shift your weight or speak. Get off when it is your floor. Will really freak people out.

#55834 Re: Help Me ! » Probability Question » 2009-05-21 07:58:49

Hi mathsyperson;

  True, the answer does converge to a limit as n gets larger. I'll edit the question to be more precise.

#55836 Help Me ! » Probability Question » 2009-05-20 22:41:10

bobbym
Replies: 166

Two numbers a and b are randomly drawn  from the unit interval {1,2,3,4,5,6,...,n} with replacement. Then 3 more numbers c and d and e are randomly drawn with replacement from the same unit interval . What is the limit of the probability that c+d+e < a+b as n approaches ∞ . Solved this but my method is gruesome.

Answer

#55838 Re: Help Me ! » Proof by Induction? » 2009-05-20 17:16:39

Sorry Kurre and thanks Avon;

I get it now. So, the original question still remains unproved?

#55839 Re: Help Me ! » Proof by Induction? » 2009-05-20 11:52:04

Hi Kurre;

  I'm not following you. When x=3, f(3) = 121 is a square.

#55840 Re: Dark Discussions at Cafe Infinity » Reaction of alkali metals with water » 2009-05-20 09:07:15

Actually one of the videos makes it sound like someone is sitting on large quantities of francium. It's more radioactive than Plutonium so large quantities are out of the question.

#55841 Re: Help Me ! » Integral » 2009-05-19 16:31:45

Hi calculusstudent

I'm getting  -x - cot(x) + c instead of your x - cot(x) +c

#55842 Re: Coder's Corner » Python! » 2009-05-19 16:24:19

Hi bossk171;

  Haven't installed 3.0 yet. Shame they haven't kept the documentation up to date. If you install it on a usb drive you might have the advantage of portability, provided it does not alter the registry.

  Ok, installed it. Yea, some of the earlier books may be out of date. Nothing to be done about that. The help does provide some good tuts and a whats new section.

#55844 Re: Dark Discussions at Cafe Infinity » Reaction of alkali metals with water » 2009-05-19 16:08:15

The size of a grapefruit! I have never seen that much.

#55845 Re: This is Cool » Chutes and Ladders » 2009-05-19 08:12:34

Hi mikau;

Thanks for the work, would have been more fun if you could have found him wrong.

#55846 Re: Euler Avenue » The Feit–Thompson theorem » 2009-05-19 07:54:45

Thought I read about a 1000 page proof in group theory. Andy's is 200, this is 250. What ever happened to the Greeks drive for simplicity?

#55848 Re: This is Cool » Maths Lecture Theatre at Queen Mary, University of London » 2009-05-19 05:41:05

You might have pointed out, where you used to sit. You probably had a favorite spot.

#55849 Re: This is Cool » Interesting groups » 2009-05-19 05:29:44

It must have taken a while. Appreciate your work.

Board footer

Powered by FluxBB