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Brain teaser

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TITO
Contributor
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11 REPLIES 11
Not applicable
Ok - you are driving me crazy & my whole office is occupied with trying to get this to work - YOU CANT THERE IS NO SOLUTION !!!
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byrant89
Occasional Contributor
it just takes a bit of concentration...
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Sfiso_1
Occasional Contributor
Lol! nice one if u want the solution click as follows: 3, 5, 6, 4, 2, 1, 3, 5, 7 then finish..... each number represnts whatever is above that rock
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Not applicable
What about this brain teaser. BODMAS (brackets, of, division, multiplication, subtraction). Addition conmes before subtraction according to this. Is 5-2+3=5-5 =0?
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byrant89
Occasional Contributor
no because -2+3 does not equal -5
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SimonPB
Valued Contributor
eddie, the math just simple wrong ..
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Not applicable
that should read 5-(2+3)= 5-5 =0
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Not applicable
Well the 5-2+3 has addition 2+3 and subtraction 5-2. In fact mathematically one should read from left to right when there are operators (- and +) of equal precedence (addition and subtraction have equal precedence and multiplication and division have equal precedence)
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Not applicable
By the way if you use a cheap calculator on 10-5x2 (correct answer is 0) it may give you 10. A scientific calculator gives the correct answer, ie 0)
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Not applicable
well on a binary scale you could be looking at 1 (or on in standard configuration and if you using the negative configuration it could be off)...so many ways to interpret it
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MenuOption
Frequent Contributor
Hi EddieM, just came across your post. BODMAS is BO(DM)(AS) where DM has equal precidence, thus done left to right. Same holds for AS, done lift to right with equal precidence.
But then, I suspect you already know this. PS does the M stand for Mathews?

Seeing that you like puzzles here is a tricky one for you.
n + n + n .... + n (n of them) = n^2
then d/dn (n + n + n .... + n) = d/dn(n^2)
1 + 1 + ... + 1 (n of them) = 2n
n = 2n
1 = 2 QED.

Apparently this puzzle is easily solved by 1st year math students, but the 3rd years have a problem spotting the mistake.
;-)
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