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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#1 Re: This is Cool » Quantum Entanglement - The new way to communicate. » 2014-05-12 04:59:48

Hmm... computers used to be giant and really bad compared to today. PC's will most likely eventually be able to do quantum computing.

#2 Re: Puzzles and Games » Help them! » 2014-05-12 04:55:15

I don't understand why they don't just put new labels on them in the correct order. they would need new containers  to put them into due to the fact that now bottle #1 is contaminated with liquid #99, So they would either have to decomtaminate the flasks, or bottle them in new bottles, or just relabel them.

#3 Re: Puzzles and Games » Add 13 more and post it forever. » 2014-05-07 04:07:52


(5 (100 - 25) - 3 (25 + 5) - 5) - 4 (35) - 7(15) - 11(2) = 13

#4 Re: Dark Discussions at Cafe Infinity » How has mathematics enriched your life? » 2014-05-07 03:58:08

I like math because when I have nothing to do but twiddle my thumbs I can take out that math problem I was trying to solve and finish it.

#5 Re: Dark Discussions at Cafe Infinity » Do you lead a Gangnam Style Life? » 2014-05-07 03:51:52

I don't fit into that category. I fit into the Really smart/really athletic category.

#6 Re: Jokes » Pi and i have a conversation » 2014-04-30 05:29:55

I think I have seen this one before. It's still pretty funny.

#8 Re: Coder's Corner » Need advice » 2014-04-30 05:15:58

Ok. Thank you. I'll look at it.

#9 Re: Puzzles and Games » Type the username above you - WITH YOUR ELBOW! » 2014-04-28 05:20:36


YES! 100% legit typing with my elbow. (Except for this message)

#11 Re: Jokes » The frog joke » 2014-04-28 05:10:36

Really nice joke. Not sure why the frog committed suicide though....

#12 Coder's Corner » Need advice » 2014-04-28 05:00:40

Replies: 6

I have absolutely no experience with programming, but I want to start. Any advice on what to start on and how to start?

#13 Introductions » Hello » 2014-04-28 04:58:24

Replies: 3

I forgot to introduce myself when I first joined.  My username is ManiticMath. I enjoy riddles and my favorite color is green.

#15 Re: Puzzles and Games » For the honor of Hufflepuff » 2014-04-27 05:00:04

So the numbers on the balls add up to the total score right?

#16 Puzzles and Games » The Unfortunate adventurers 2 » 2014-04-27 04:40:50

Replies: 1

A band of adventurers was getting ready to raid a goblin camp. They had learned their lesson from their last adventure and brought a wizard to detect magically concealed traps. However, the wizards mind was slightly disorganized from a potion he had tested on himself, so he could only communicate by writing, and even that wasn't very clear.As the adventurers approached the camp, they saw a large clearing with a few trees. Here is  what the wizard wrote.

Tuhiefrsef ijst ab pqijtu fgablmlm tursabpq bcefnoefabtuhi tuhief opabkl tursefef. Tuhief bcijrscdhi tursefef ijst efnocdhiabnotuefde tuop abtutuabcdkl abpqpqrsopabcdhiijnogh pqefoppqlmef. Tuhiefrsef ijst ab cdopnocdefablmefde ghopbclmijno lmopopklopuvtu bcyz tuhiabtu pqopnode.

The adventurers quickly figured it out and took a safe way to the goblin camp.

What was the message, and what did the potion do to the wizard?

#17 Re: Dark Discussions at Cafe Infinity » This place is my new home... » 2014-04-27 00:30:14

Hmm.... I didn't know you had to report your freetime either..

#19 Re: Dark Discussions at Cafe Infinity » Everything » 2014-04-26 10:54:34

The bible is considered as the word of God by Christians because we believe that God inspired the authors of the bible in what they wrote. Basically he used them to convey what he was saying. You might ask why he wouldn't just say it himself and cut us out of the equation. The answer would be that he wants to include us. It's really interesting to study the bible if you have time.

#21 Re: Puzzles and Games » The Unfortunate Adventurers » 2014-04-25 23:54:09

Have fun with this one. I'm working on a few more puzzles.

#22 Puzzles and Games » The Unfortunate Adventurers » 2014-04-25 23:48:49

Replies: 3

So here's a puzzle I made for you guys.

A group of 207 adventures group up to slay a dragon. They get the the mountain the dragon lives in and enter it. Unfortunately for them they all fall in to one of the dragons traps and are captured, and now weaponless.

The dragon likes to give large groups of people a puzzle. He gives 69 adventurers 2 bronze coins, He then gives 75 adventurers 3 silver coins, and gives the remaining 63 1 gold coin each. The dragon says that if everyone has the same value of coins in their hands when he comes back, they can all leave.

Now, It takes 3 bronze coins to equal a silver coin,and 4 silver coins to equal a gold coin.

The dragon comes back within five minutes. All the adventurers make it out alive. How did they do it?

#23 Re: Puzzles and Games » Monty Hall puzzle » 2014-04-25 23:32:38

Ok. I understand now.... Thanks for showing me why. I see why the answer you  guys gave was right, but please make the answer explain more.

#24 Puzzles and Games » Monty Hall puzzle » 2014-04-25 11:08:27

Replies: 15

I must protest the answer they gave for the Monty hall puzzle. The puzzle is as follows.

The host, Monty Hall, offers you a choice of three doors. Behind one is a sports car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).
Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.
You cannot hear the goats from behind the doors, or in any way know which door has the prize.
Should you stay, or switch, or doesn't it matter?

The answer they gave is as follows.

Your first choice has a 1/3 chance of having the car, and that does not change.
The other two doors HAD a combined chance of 2/3, but now a Goat has been revealed behind one, all the 2/3 chance is with the other door.
You better switch!
(Unless you really want a goat)

I don't understand how they got there to be a 2/3 chance for the other door.
When you start out, you have a 2/3 chance of picking a goat, and a 1/3 chance of picking a car. You then pick a door, and then one of the doors with a goat is revealed. This now means that there is 1 door with a car behind it, and 1 door with a goat behind it. There should be a 50:50 chance for the car and the goat. So either the puzzle answer is wrong, or there is some part of probability that I don't know about.Can someone explain why the answer put 2/3 of the chance of the car on the other door?

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