Need some maths wiz..4=3??!??

Discussion in 'The Rant Section' started by C0kaCoLa, Apr 10, 2007.

  1. C0kaCoLa

    C0kaCoLa Well-Known Member

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    Asians are labelled as maths genius.. Lets see who can find the mistake behind this

    4=3

    Proof:

    a=b
    4a-3a=4b-3b
    4(a-b)=3(a-b)
    4=3(a-b)/(a-b)

    4=3
     
  2. secluded

    secluded Well-Known Member

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    I could be wrong, but:

    a=b
    (a-b)=0
    therefore, you cannot do 3(a-b)/(a-b) since 0/0 is indeterminate.
     
  3. dim8sum

    dim8sum ♫♪♫♪♫♪♫♪♫♪♫♪....

    problem with that is a is NOT equal to b

    *geek* :D
     
  4. Lilydream

    Lilydream Well-Known Member

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    well i'm not agenius in math but for me the answer will be : (a²-b²) (4-3)= 0 and then u get 2 solutions a²-b²=0 or 4-3=0 ( and 4=3)
     
  5. AVANT

    AVANT Well-Known Member

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    That's my answer.

    The a=b in the first line assumes that a and b ARE equal. Sub in the number 2 for both a and b, then try to see what's wrong with the math problem again ;)

    (a²-b²) (4-3)= 0 -huh Dunno how you got that.
     
  6. kdotc

    kdotc 안녕하세요빅뱅K-Dragon입니다

    who says a=b and 4a-3a=4b-3b?
     
  7. Lilydream

    Lilydream Well-Known Member

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    oops the ² was wrong, i was thinking about another thing

    but here the right answer

    4a-3a=4b-3b
    4a-3a-4b+3b=0
    4(a-b) + 3 (a-b) =0
    (a-b) (4+3)= 0
    then 2 solutions:
    a-b=0 or 4+3=0
    a=b 4=-3
     
  8. AVANT

    AVANT Well-Known Member

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    Actually...
    4a-3a-4b+3b = 0 would become
    4(a-b)+3(-a+b) = 0

    4(a-b)+3(-a+b) is not the same as 4(a-b) + 3 (a-b)
     
  9. sp-lork

    sp-lork Well-Known Member

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    ^ ugh...makes my head hurts ><;; so much for asians being good in math..or maybe it's just mee -sweat
     
  10. Lilydream

    Lilydream Well-Known Member

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    maybe for u it's not but for me it is and this is like that i learn math before get my bachelor...no matter where is the sign it will be the same thing ..;the place of sign will have a meaning only if the unknow is determine by advance (sorry for my bad english)
     
  11. hiake

    hiake Vardøgr of da E.Twin

    This "equation" proved NOTHING. If you use the simplest operation possible, then:
    a=b
    4a-3a=4b-3b
    if you do the simple arithematic, not grouping them...
    a=b

    Plus, because given a=b
    a-b=0
    (a-b)/(a-b)=0/0
    it's indefinite, not cancels out.

    Oops, someone said that already.

    the two are equal since a=b is the given premise.
    a=b
    a-b=0
    -a+b=b-a=0
     
  12. WilliamStorm

    WilliamStorm Well-Known Member

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    Hmmmm Ive been looking at all these answers for a while now, like 20 mins LOL and i think Secluded's was the best.

    Hmm and after thinking a bit more, U are saying 4=3 only if a=b, which i dunt feel has proved anything...but then again thats just me^^ very interesting tho
     
  13. renegade_cash

    renegade_cash Well-Known Member

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    hahahah i love how people are so modest here... secluded was right on the first try!
     
  14. WilliamStorm

    WilliamStorm Well-Known Member

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    Yeapp~~ ::applaudes:: to Secluded!
     
  15. lol this further proves why he's gettin his ass kicked all the time... -lol

    he needs to take those math skills n design booby traps...
     
  16. AVANT

    AVANT Well-Known Member

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    A variable represents a value, even if it's not determined in advance, you always have to be careful with it's sign.

    For example.
    If you had 2 variables, c and d which are not equal.
    c - d would not be the same as d - c just because they haven't been declared yet.

    So if we were to suddenly sub in 1 for "c" and 2 for "d",
    c - d = -1
    -c + d = 3

    Notice how secluded ended up with "4=3(a-b)/(a-b)" and you got "(a-b)(4+3)=0"? It's because of your misplaced negative sign.

    From
    4(a-b)+3(-a+b) = 0, you'll lead to secluded's, hiake, and my answer
    as it would turn into
    4(a-b) = 3(a-b)

    From
    4(a-b) + 3 (a-b) = 0, you'll get the answer you got
    (a-b)(4+3) = 0

    -a+b = b-a is always the same. (That's wasn't what I was commenting on tho ;))
    -a+b and a-b however are not. If a and b are equal, than yes, they may result in the same thing, but it's still a math mistake to not place negatives in the right place (as shown by the above example).
     
  17. dim8sum

    dim8sum ♫♪♫♪♫♪♫♪♫♪♫♪....

    yeh but the fact is if one variable is named a and another b, they cannot be equal otherwise it would be a=a or b=b

    So no matter what equations you try to do, you cant because its based on a=b which is wrong
     
  18. WilliamStorm

    WilliamStorm Well-Known Member

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    Cokacola, u said "who can find the mistake within this" yeh? Meaning u got the question from somewhere, so wheres the correct answer??
     
  19. xiaojia

    xiaojia Well-Known Member

    argh.. this aint even maths..
     
  20. Lilydream

    Lilydream Well-Known Member

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    Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
    Albert Einstein