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#176 Re: Exercises » Exercises » 2007-04-11 19:01:11

Your method works too, nice job.

#177 Re: Dark Discussions at Cafe Infinity » Haikus » 2007-04-11 13:53:43

Haikus looks so kool
I wonder what Haikus is
Get it Never mind.

#178 Re: Help Me ! » Is it true » 2007-04-11 13:45:21

My proof works either , I just need to prove the case when n=even

#179 Re: Help Me ! » Algebra » 2007-04-11 02:25:16

My first guess , is , x=10 , y=6 .

#180 Re: Introductions » Not much of an introduction » 2007-04-10 16:38:28

Naruto... I more like some hilarious ones.

#181 Re: Help Me ! » Verification of Trig Identities » 2007-04-10 11:42:24

What is Verification of Trig Identities ?
According to my understanding

If u don't remember the formula , check out the formula section on this forum.

#184 Re: Help Me ! » 3 discrete math problems: 1. countable sets, 2. probability, 3. pascal » 2007-04-10 10:44:17

#2 , see my post here http://www.mathsisfun.com/forum/viewtopic.php?id=6786 , maybe it will help you.

#185 Re: Help Me ! » Is it true » 2007-04-09 15:12:23

K=odd , this holds, if k= even ,this holds too , then throw n dices , the probability of getting an even sum will be 0.5

#186 Help Me ! » Is it true » 2007-04-09 14:58:54

Stanley_Marsh
Replies: 3


I've already prove the case when n is odd, then I used induction to prove this , the calculation is tiresome , not sure it's right tho.

#187 Re: Help Me ! » Set problem » 2007-04-09 14:54:19

O, but that's very hard to come up with such prove.

#188 Re: Help Me ! » Set problem » 2007-04-09 09:28:16


The proof is like this :
 

Here is what I dont understand, When he defined

That h is positive , then q is already an interior point , why does he need to make it so complicated.Or I miss something?

#191 Re: Introductions » hi friends » 2007-04-08 19:36:29

India ppl's math are amazing! welcome!

#192 Re: Introductions » Spongebob Sqaurepants » 2007-04-08 19:35:32

I am more Simpsons, SOuth Park , Family guy ~tho.

#193 Re: Help Me ! » Proof » 2007-04-07 21:09:50

WoW , but I haven't learned about that

#194 Re: Help Me ! » Proof » 2007-04-07 17:46:52

If no solution


Get a=-1

#195 Re: Help Me ! » Proof » 2007-04-07 17:34:17

If the equations have infinite solution , then the two must be the same , transform them get


Then :

Get a=1 , Is this correct?

#196 Help Me ! » Proof » 2007-04-07 17:25:47

Stanley_Marsh
Replies: 4

A set of equation


  For waht values of a does the system fail to have solutions, and for what values of a are there infinitely many solution.

#197 Re: Help Me ! » Summation help. » 2007-04-06 10:58:50

Actually when n=even number, the equality above still holds, but I haven't proven it yet,
Then the probability will be 1/2.

#198 Re: Help Me ! » Summation help. » 2007-04-05 21:25:36

You will find for n=odd number.

#199 Re: Help Me ! » Summation help. » 2007-04-05 21:13:28

I just thought of something , every time you throw a dice , the probability of an even number is 1/2 which is equal to getting an odd number.  If the sum is even , then 

is the probability of getting an even sum . And
you will find

#200 Re: Help Me ! » Summation help. » 2007-04-05 14:13:54

If u can prove that the set of the Sum is equal to the set of all positive integer.  Then the probability of getting a random even number is 50%.  I am not sure tho, it's just my opinion.

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