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Re: math problem plz

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Tenal is not online. Tenal
Joined: 15 May 2011
Total Posts: 18684
15 Aug 2012 11:16 PM
you can only use four 7's, and you need to make it equal 18. you're permitted to use any math sign
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awsumpwner27 is not online. awsumpwner27
Joined: 03 Sep 2011
Total Posts: 4389
15 Aug 2012 11:30 PM
You said I could use only four sevens, but you never restricted the use of other numbers!

18 + 0 = 18

Aha!

(I'm so sorry. Don't eat me please.)
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lombardo2 is not online. lombardo2
Joined: 30 Nov 2008
Total Posts: 1604
15 Aug 2012 11:36 PM
math.floor(math.sqrt((7*(7^2)*7)/7))
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ImadudeDevil is not online. ImadudeDevil
Joined: 20 Dec 2010
Total Posts: 1477
15 Aug 2012 11:38 PM
1+1=18
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DarkShadow01 is not online. DarkShadow01
Joined: 19 Nov 2007
Total Posts: 25
15 Aug 2012 11:42 PM
18+7-7+7-7
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stravant is not online. stravant
Forum Moderator
Joined: 22 Oct 2007
Total Posts: 2893
15 Aug 2012 11:47 PM
If you mean +-/* as the signs I'm fairly certain it can't be done after brief though.

If you're allowing arbitrary powers then your question is badly formed because we can just take log_7(18) or something like that and use it as a power and we're done.

If you do allow only integral powers then there's probably a solution which you can get something like this:

(7^n + 7^m) / (7^a + 7^b)
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xXxMoNkEyMaNxXx is not online. xXxMoNkEyMaNxXx
Joined: 03 Oct 2008
Total Posts: 3120
16 Aug 2012 04:10 AM
floor(sqrt(7*7*7+7))
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QuantumSama is not online. QuantumSama
Joined: 24 Jun 2011
Total Posts: 14
16 Aug 2012 12:02 PM
77/7+7
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su8 is not online. su8
Joined: 06 Mar 2009
Total Posts: 6334
16 Aug 2012 12:09 PM
omg a new mod that doesn't allow replies

bada
ss
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pighead10 is not online. pighead10
Joined: 03 May 2009
Total Posts: 10341
16 Aug 2012 12:44 PM
"If you mean +-/* as the signs I'm fairly certain it can't be done after brief though."

"77/7 + 7"

a bit too brief thought
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HotThoth is not online. HotThoth
Forum Moderator
Joined: 24 Aug 2010
Total Posts: 1176
16 Aug 2012 01:13 PM
These puzzles are cool; my turn!

Nifty corollary: with four of any digit 1-9 and no other numbers (but any math sign/symbol), it is possible to write an expression which evaluates to 11. Anyone see how to do this?



- HotThoth

~ I Thoth so ~
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BlueTaslem is not online. BlueTaslem
Joined: 11 May 2008
Total Posts: 11060
16 Aug 2012 01:13 PM
Concatenation isn't a math operator. The problem really is really terrible though.
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QuestionableJuggs is not online. QuestionableJuggs
Joined: 18 Jun 2012
Total Posts: 150
16 Aug 2012 01:18 PM
"Nifty corollary: with four of any digit 1-9 and no other numbers (but any math sign/symbol), it is possible to write an expression which evaluates to 11. Anyone see how to do this?"

9 + 5 - 2 - 1

ez
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Seranok is not online. Seranok
Joined: 12 Dec 2009
Total Posts: 11083
16 Aug 2012 01:21 PM
> with four of any digit 1-9 and no other numbers (but any math sign/symbol), it is possible to write an expression which evaluates to 11. Anyone see how to do this?

(3^3)/3+3
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Prehistoricman is not online. Prehistoricman
Joined: 20 Sep 2008
Total Posts: 12490
16 Aug 2012 01:23 PM
9+2 lolwut
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HotThoth is not online. HotThoth
Forum Moderator
Joined: 24 Aug 2010
Total Posts: 1176
16 Aug 2012 01:24 PM
That's not what I meant, DubiousJars :P
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HotThoth is not online. HotThoth
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Joined: 24 Aug 2010
Total Posts: 1176
16 Aug 2012 01:25 PM
Read: Using *exactly* four of the same digit (1-9).

:P
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Prehistoricman is not online. Prehistoricman
Joined: 20 Sep 2008
Total Posts: 12490
16 Aug 2012 01:25 PM
There isn't a user under the name of DubiousJars...
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Seranok is not online. Seranok
Joined: 12 Dec 2009
Total Posts: 11083
16 Aug 2012 01:26 PM
Brb gotta go namesnipe that
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Prehistoricman is not online. Prehistoricman
Joined: 20 Sep 2008
Total Posts: 12490
16 Aug 2012 01:28 PM
3*5-1-3

:|
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QuestionableJuggs is not online. QuestionableJuggs
Joined: 18 Jun 2012
Total Posts: 150
16 Aug 2012 01:33 PM
"That's not what I meant, DubiousJars :P"

DubiousJars...I like it
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Seranok is not online. Seranok
Joined: 12 Dec 2009
Total Posts: 11083
16 Aug 2012 01:33 PM
^ it'll cost ya
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stravant is not online. stravant
Forum Moderator
Joined: 22 Oct 2007
Total Posts: 2893
16 Aug 2012 01:35 PM
I was thinking of only using the number 7, not the digit 7, fail.

I'm never that good at these.
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Prehistoricman is not online. Prehistoricman
Joined: 20 Sep 2008
Total Posts: 12490
16 Aug 2012 01:36 PM
^
When being a robot isn't necessarily a good thing :)
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Legend26 is not online. Legend26
Joined: 08 Sep 2008
Total Posts: 10586
16 Aug 2012 01:36 PM
Badly worded problem to say the least.
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