Math Is Fun Forum

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

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#201 Re: Introductions » hi » 2008-03-03 00:28:16

Hello, coconut! Nice name!

So, from which country did you come from? I'm from an archipelagic country, which is situated in the SEA and is currently bestowed with the honor of having a major tectonic plate named after it.

#202 Re: Jokes » animal jokes!!!!! » 2008-03-01 01:07:29

Why did the chicken go to the other side, jumped in a puddle of mud, and went back to the other side?

He was a dirty double crosser!

#203 Re: Puzzles and Games » The Nhoj Files » 2008-02-28 15:57:56

Yep. Mathsys:3

So, was the man lying or not? Was that the real diamond?

#204 Re: Puzzles and Games » The Nhoj Files » 2008-02-27 16:05:09

The Nhoj Case Files # 14: The Case of the Confusing Diamond

I am, once again, finding myself with two persons who don't have anything in common and are ,right now, arguing.

"That is not the real diamond! You thief! Where is it?", the lady shouted, pointing to the small stone on the hand of the man.

"This is the real diamond!", the man objected. "In fact, I have proof!", he added. taking a hammer out of his briefcase. Why he had a hammer in the first place, I didn't want to find out.

Placing the stone on a table, he carefully aimed the hammer at the ?diamond and with one big arc, hit the stone with so much force that the table quivered. The stone remained intact.

"See? It didn't break? Therefore, it is a diamond, which is the hardest mineral on Earth!", he cried triumphantly.

"You have a point," said the woman reluctantly,with a voice sounding of defeat.

"No he doesn't," I said.

Why doesn't he?

#205 Re: Dark Discussions at Cafe Infinity » Cow Bull 1 » 2008-02-27 15:53:17

JaneFairfax wrote:

Mathsy has narrowed down the possibilities – and brilliantly done, too. Without his Guess#4, there’s a chance that the game might stretch to 7 guesses. Guess#4 has ensured that the game will not extend beyond 6 guesses.

Guess#5: 129

On the other hand, without his Guess#4, there would have been a probability of 0.25 that the game could have ended in just 4 guesses! tongue

I am not good at this!

Guess 5: 3b!

I guess you won, with special mentions to Mathsys

#206 Re: Dark Discussions at Cafe Infinity » Whats everyone's background? » 2008-02-27 15:48:46

I'm from the philippines, though I haven't attained special math abilities (still in highschool)

#207 Re: Dark Discussions at Cafe Infinity » Cow Bull 1 » 2008-02-25 23:21:10

Oddly enough:

Guess#1: 952 – 2c

Guess#2: 297 - 2c

Guess#3: 829 - 2b

Guess#4: 314 - 1c

To Mathsys: That would not have been the answer due to Guess 3 results. Still, You might have just wanted to narrow down the possibilities.

I'm thinking one should get this already

#208 Re: Dark Discussions at Cafe Infinity » Cow Bull 1 » 2008-02-24 22:53:54

Guess#1: 952 – 2c

Guess#2: 297 - 2c

Guess#3: 829 - 2b

Nice.

#209 Re: Dark Discussions at Cafe Infinity » Q20 » 2008-02-24 22:40:10

3 has anything to do with the Arts?

#212 Re: Dark Discussions at Cafe Infinity » Cow Bull 1 » 2008-02-22 17:55:07

Anyone is welcome to be the one who gives the number!!!

Since no one did, can I have another turn?

Guess away!

#215 Dark Discussions at Cafe Infinity » Pet Peeves... » 2008-02-16 20:44:22

JohnnyReinB
Replies: 5

What really annoys you? Something that seems insignificant to others, but drives you mad?

For me, it's subject-verb disagreement mad . This is very prevalent at school in the Lord's Prayer. the annoyance starts at:

Forgive us our sins
as we forgive those who sins against us.

What's worst is that our English teacher (who's usually excellent in English, except for her insisting that baggages is the plural of baggage  tongue ) seems to ignore it.

So, enough about me, what's your pet peeve?

#217 Re: Puzzles and Games » Where is the remainding $1 » 2008-02-16 16:17:22

This is actually due to addition of the wrong figures. By discounting 5$, they actually pay approximately $23.33 each, for a total of $70. They get $3 back, making the total $73. Add the amount the waiter took, the total would be $75. Yey!!!!

#219 Help Me ! » Lines Passing through a Circle... » 2008-02-15 23:17:50

JohnnyReinB
Replies: 1

Can anyone prove this:

N = (x^2+x)/2 + 1

with x=number of lines passing through a circle

N= the maximum number of regions created with sides made of the lines and/or the edge of the circle

E.G.

with one line...

(1^2+1)/2 + 1 = 2 regions

with 2 lines:

(2^2+2)/2 + 1 = 4 regions

with 5 lines...

(5^2+5)/2 + 1 = 16 regions



I can see that this is true up to 6 lines by drawing them, but is it true up to, I dunno, 100 lines?


P.S.

How do you upload an image?

#220 Re: Help Me ! » Fibonacci Sequence » 2008-02-15 17:15:17

Hmm, I'm thinking this has something to do with PHI...

#221 Re: Help Me ! » Algebra » 2008-02-15 16:58:59

How 'bout:


Line n:  1/(n+1) - 1/(n+2) = 1/(n+1)(n+2)
                                      = 1/(n^2+3n+2)

#225 Re: Puzzles and Games » The Nhoj Files » 2008-02-15 15:33:30

Yes, you can assume. At least, that was what I did. hehe...

3 points total, Jane!

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