Matt71
Using the digit 7 five time, place the basic arithmetic signs in between the digits to obtain a total of 540
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pratu043
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nice question.....
Matt71
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I know, it's been driving me nuts
pratu043
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can you join two 7s together to form 77?
Matt71
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Nah, you gotta put the signs in between each one
Matt71
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You're going crazy, aren't you?
Stom
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this question is right r u sure?
Stom
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because if it is not then bad things will happen
Matt71
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Yeth, I'm pretty sure it's the question
Matt71
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And now everyone's thinking...
nikhil389
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It would be fast to do with computer code, any one good with programming ?
wasiqss
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certainly question of the week
Stom
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yes certainly
TuringTest
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8
if it doesn't get solved here put it in the meta-math section for future reference
Matt71
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I've really been trying this for a while and I think it's messed up
anyone else think it's impossible?
Matt71
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as in, it's total overload here
jimmyrep
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i'm not sure if this fits the rules but
77 x 7 + (7 / 7) gives 540
TuringTest
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8
+ - / and * only, right?
no squaring or anything?
Ishaan94
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concatenation isn't arithmetic right?
nice work jimmyrep btw
Matt71
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jimmyrep, if no one can find a solution without the placing two 7s together, I'll use your solution
jimmyrep
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ok
pratu043
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i don't think you can do it without joining two 7s together, jimmy rep has the right answer.
jimmyrep
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77 is probably not allowed
wasiqss
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jimmy rep yehh 77 not allowd
Matt71
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It's probably not, but if it isn't I think it's impossible. I've been over this for over two hours, can't do anything to solve it. Yes, two hours, that's how obsessed I am with this question.
jimmyrep
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these types of question are obsessive!
Matt71
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Yep
pratu043
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you can't do it because 540 is not divisible by 7.
Matt71
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I KNEW IT! All that time wasted, I COULD'VE BEEN PLAYING TETRIS!
jimmyrep
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lol
Matt71
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Sweet baby turtles, I can't believe I missed that fact
TuringTest
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8
that doesn't make a difference, you can make four 5's into 26 even though 26 is not divisible by 5
5*5+(5/5)
pratu043
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Oh I see.....
moyo
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in jimmy's example, he used 7/7 to add 1...
Matt71
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Oh, yeah, then my time HASN't been a complete waste
Matt71
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Good observation...
moyo
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are parentheses allowed?
TuringTest
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8
I would think so... it's just multiplication
Matt71
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Yeah
moyo
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i was thinking maybe there was an order of operations trick to solving it or something... grasping at straws :-)
shadowfiend
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You don't need them though, order of operations takes care of the problem above.
jimmyrep
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yes - i didn't need the parenthesis
sandra
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It all depends on if digits can be stacked without operations (is 77 valid?) - in which case 7*77+7/7 works as jimmyrep mentioned
Matt71
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question y u no make sense? ლ(ಠ益ಠლ)
shadowfiend
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I feel like concatenation is needed here though. I'm not sure there's another way to grow the number fast enough while reserving 7/7 to make the difference of 1 you need to get to 540 itself.
wasiqss
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this is certainly a crap question because 540 is not divisible by 7 and i advise ppl to stop wastin time on it
TuringTest
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8
I already pointed out that the fact that 540 is not divisible by 7 makes no difference, read above
TuringTest
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8
the problem is sitting in meta-math now, so it can be viewed in the future by someone who can figure this out, or prove it to be impossible.
Matt71
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Sooooooo, you can't get a straight answer right?
TuringTest
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8
not here, not now...
Tomas.A
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this is correct answer
Matt71
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Bummer huh
Matt71
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Oh, well, guys I don't want to completely waste all your time
Matt71
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So, if everyone please get together with the plan and just randomly give everyone you can medals!
TuringTest
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8
Like I say, check the meta-math section in the future, someone will probably either find the answer or prove it impossible... eventually.
Matt71
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Thanks, to everyone, for all the help
Stom
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what an awesome way to waste time
TuringTest
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8
:)
Matt71
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Well, medals or wasted time right? Might as well
Stom
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but to prove it impossible without a computers help is going to be interesting
TuringTest
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8
moneybird has a knack for this kind of thing, but he's not around.
Matt71
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Yep, but it's gonna take a looot of time and luck
Matt71
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Yeah, something about koalas that makes him as smart as he is
TuringTest
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8
jejeje...
Stom
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yo
Stom
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why r ppl still on this question,
u u ppl stil solving it?
TuringTest
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8
I'm thinking it is impossible:
adding 7/7=1 is the only way I can see to get to a number that is not divisible by 7, which only leaves three 7's left over, and the most we can make that into is
7*7*7=343
taking 540-(7/7)=539
and
539/7=77
hence it seems jimmyrep's answer is the only one possible, but I don't think this is a true proof that it is impossible.
Janie29
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I tried a bunch of different ways, and I can't find an answer. Now I have a Chem Final in 45min., and this problem is all I'll be thinking of!
Tomas.A
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JIMMY IS CORRECT :P