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Subject: You guys gotta help me...
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Ok I cant play Halo 2 on live till i figure this out. "Use three 7's and mathematical symbols (no exponents) to construct an expression equal to 20". This is for my Uconn problem solving course and it is driving me crazy. Please help!

  • 01.26.2005 5:56 PM PDT
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thats hard if you ask me.











Go ahead, ask me.

  • 01.26.2005 6:03 PM PDT
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i didn't read the question right and damned if ill read it again

7+7+7-1?

  • 01.26.2005 6:03 PM PDT
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Posted by: ðcherryð
i didn't read the question right and damned if ill read it again

7+7+7-1?


Not even close, you crazy kid.

[Edited on 1/26/2005 6:05:15 PM]

  • 01.26.2005 6:05 PM PDT
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7+7+7-x

  • 01.26.2005 6:08 PM PDT

Devil is Double is Deuce and Joker always trumps Deuce.

7-7+7=I have no idea how to help you.

  • 01.26.2005 6:09 PM PDT
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Posted by: Wolf 010
7+7+7-x


That gives you 21

  • 01.26.2005 6:09 PM PDT
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Posted by: Stalking Puma
Posted by: Wolf 010
7+7+7-x


That gives you 21


21-x

  • 01.26.2005 6:11 PM PDT
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not if x equal 1.

  • 01.26.2005 6:11 PM PDT
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Posted by: Stalking Puma
Posted by: Wolf 010
7+7+7-x


That gives you 21

No, that gives you 21-x.

  • 01.26.2005 6:12 PM PDT
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1- You can't use variables.
2- It wouldn't make any sence to use variables because you can't give a value to them.

  • 01.26.2005 6:12 PM PDT

Devil is Double is Deuce and Joker always trumps Deuce.

7+7+X=Y
Y=7-2x

Solve.

  • 01.26.2005 6:13 PM PDT
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but you can only use se7ens, and that doesn't inclued X, and if you use a variable, like X, that doesn't mean it even "might be" 1, and the way you wrote it, would make it 21:

7+7+7-X =
21-X =
-X = -21
X = 21

[Edited on 1/26/2005 6:15:12 PM]

  • 01.26.2005 6:14 PM PDT
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yeah, the problem with using variables is either that
a. you cant put a value to them because only three 7's are allowed
b. they have to be 7, and therefore arent a variable anymore.

  • 01.26.2005 6:15 PM PDT
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Posted by: MCs Brother
7+7+X=Y
Y=7-2x

Solve.


y=x+3.5

  • 01.26.2005 6:19 PM PDT
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7! which is 5040. /7 - 700. donno if zeros count

so its 7!/7 - 700 maybe

  • 01.26.2005 6:21 PM PDT
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...i hate math!

  • 01.26.2005 6:22 PM PDT
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if you love problem solving, try this thing
Frogs

  • 01.26.2005 6:27 PM PDT
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There is a reason I almost fail math every year... I just got a huge headache reading this stuff :(

  • 01.26.2005 7:08 PM PDT
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Can you use fractions?

  • 01.26.2005 7:12 PM PDT
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crap, never mind.

[Edited on 1/26/2005 7:21:23 PM]

  • 01.26.2005 7:20 PM PDT
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i think i have it....

7 x 3 - 7 / 7 = 20

  • 01.26.2005 8:08 PM PDT
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Posted by: Diablo4818
i think i have it....

7 x 3 - 7 / 7 = 20


you used a three...

But that still may count!

  • 01.26.2005 8:13 PM PDT
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Posted by: eliteskull94
Posted by: Diablo4818
i think i have it....

7 x 3 - 7 / 7 = 20


you used a three...

But that still may count!


No you can only use three sevens, and only sevens.

[Edited on 1/26/2005 8:16:17 PM]

  • 01.26.2005 8:15 PM PDT
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i think it is impossible

  • 01.26.2005 9:15 PM PDT

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