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I'm placing bets on mods or SPIRIT.....I didn't give anyone a down (I promise!) and if I did, it wouldn't put us this deep in the negatives,  SPIRIT has the power to decrease,  but I doubt he would, so I say mods!

Quadrant I has points in which both the x-value and the y-value are positive.

There is a neat website that factors numbers for you:

whos thumbing down our answers??????????????????????????????????

I'm perfectly happy!

This is......confusing!  I think that sums it up!

see now i get it thanks geno

I fully agree with the 1/3, 2/3 probabilities.

At the beginning, the player has a 1/3 chance of getting the correct door; the host has a 2/3 chance of having the correct door.

The host gives the player the option of trading sides. If the player trades, then the player gets the host's 2/3 chance of winning. (Showing an incorrect door doesn't change the chances; the host must always start with (at least) one losing door. All this does is fake people into believing that the chances are 50-50.)

Whoops!  I still don't get it!  I made a mistake....I'm not worrying anymore

and I HATE TayJay and CPhill

woah woah woah now what are you trying to say by use you common sense? I dont know where you come fom but that aint used lightly around here

I don't understand you, and 1/3 + 1/2 does not equal 2/3.

To explain further, you can use your common sense to get the gut.

If there are 100 billion doors, 99 billion doors are toy cars, and 1 door is sports car.

If you randomly choose one, it's really unlikely to get sports car.

After you choose, host opened all the door with toy cars except one door and the door you chose.

Which one is likely to be sports car?

Use your common sense.

suck my b***s

Thanks!  I appreciate!

It goes way back in the day Z.  Do you think a magic egg rained out of the sky and a new creature,  later known as a chicken,  was in?  No.  Chicken came first,  and they continue to reproduce.

Enough of this.  I'd rather eat chicken tenders right now!

i still dont get it the question asks if you are left with two doors 50/50 and your trying to get a sports car (So obviously your not going to pick curtain 3) Then you would have two left to pick from curtain A and B 50/50?

Do you guys actually type all the letters?

Okay.   So 1/3 is your chance at the beginning.  If wrong, 1/2 is your chance afterward.  You add them, and get 2/3

$${\mathtt{4}}{\mathtt{\,\times\,}}\left({\mathtt{\,-\,}}\left({\mathtt{4}}\right){\mathtt{\,-\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{6}}\right) = -{\mathtt{88}}$$

So let's assume that Door A is Sports car. Door B and C are toy.

At first time, if you chose door A, and if you switch afterward, you will 100% get toy.

At first time, if you chose door B, and if you switch afterward, you will 100% get sports car.

The same with C, at first time, if you chose door C, and if you switch afterward, you will 100% get sports car.

Therefore if you switch afterward, the probability of getting sports car is $$\frac{2}{3}$$.

If you don't understand, I can explain further.

1 1/3=4/3

4*1=4

3*4=12

4/12=1/3

1/3 is the answer

1...is there only common factor

Ok let me explain. Give me 2 min.

The question!  

No just ignore me.  Your welcome