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2 + 2 = 5 ( Silly puzzle of the Day) [SOLUTION ADDED]

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R Raj Lal

i don't think a lot of people here agrees to that, because the question is very simple , just one line and there is no scope of misunderstanding it. i added a bit of confusion to make it difficult to understand on the first place and there is only one MATHEMATICAL ACCURATE solution to it. and i do have the solution to it

PIEBALDconsult wrote:

When I read a puzzle like that (poorly-worded) on the Web I can only assume that the poster left out such details in the interest of brevity, or not realizing the scope of the error, or because he's smoked too much weed.

Very interesting interpretation though

Omit Needless Words - Strunk, William, Jr.

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PIEBALDconsult

wrote on last edited by

#29

OK, I reread it again. If indeed

Quartz... wrote:

the question is very simple , just one line and there is no scope of misunderstanding it

and the only question there is Can a "mathematician in you" also do this ? then, my answer is, "Yes". But that doesn't satisfy

Quartz... wrote:

there is only one MATHEMATICAL ACCURATE solution to it

So, perhaps the answer you seek is, "No". At any rate, ask the question without

Quartz... wrote:

added a bit of confusion to make it difficult to understand on the first place

because otherwise I must assume you've smoked too much weed.
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R Raj Lal

In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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szukuro

wrote on last edited by

#30

Math.Round(Math.Tanh(2) + Math.Sinh(2)) is 5 :)
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R Raj Lal

In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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Raj Lal

wrote on last edited by

#31

Ist one sqrt( (.2) ^ (-2) ) [^] i can hear your "huh!" 2nd one as some of you have already guessed the mirror just reflect and our eye see the image horizontally . The reason why it appears to reverse left/right is because of the symmetry of our body. nice weekend

Omit Needless Words - Strunk, William, Jr.

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R Rama Krishna Vavilala

Out of curiosity, where are all these puzzles coming from? Have you bought a book?
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Raj Lal

wrote on last edited by

#32

Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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J Joe Q

Quartz... wrote:

In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5

Use extreamly large values of 2! Joe Q
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Raj Lal

wrote on last edited by

#33

Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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R Rob Graham

Quartz... wrote:

Why is it that the mirror appears to reverse left and right, but not up and down?

The mirror doesn't rotate anything. It reflects the image back without any rotation about any axis. A human observer looking at you from the mirrors location would have to rotate about his vertical axis, thus reversing his left and right from your perspective
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Raj Lal

wrote on last edited by

#34

Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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C Chris Losinger

Quartz... wrote:

But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down?

looking into a flat mirror reverses the Z axis, mentally: what points at the mirror in real life points out in the reflection. so we assume the reflection is of a person facing us, which would put his right arm on our left side, because that's true for real people facing us... but, it's not a person facing us, and it doesn't actually swap left and right. and it doesn't appear to swap up and down because we don't assume people facing us are upside down. but we do assume people facing us have their left on our right. we're just fooled by our assumptions.

Quartz... wrote:

2 with 2 and make it a 5

no time for such foolishness. it's 5:30! time to go home!

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Raj Lal

wrote on last edited by

#35

Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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E Ed Poore

Can't remember the exact solution but I'm pretty sure it involves multiplying by infinity, adding something or other (because infinity + x is infinity) then cancelling out the infinities resulting in the imbalanced equation. I think anyway :scratches head:

I have no idea what I just said. But my intentions were sincere.

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Raj Lal

wrote on last edited by

#36

Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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S szukuro

Math.Round(Math.Tanh(2) + Math.Sinh(2)) is 5 :)
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Raj Lal

wrote on last edited by

#37

i haven't checked that but seems to be a good solution if it is accurate Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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P PIEBALDconsult

I really wish that only well-worded puzzles were posted. If this is from a book, please post the full, complete, exact text of the puzzle. Plus attribution would help.
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Raj Lal

wrote on last edited by

#38

Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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R Raj Lal

In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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DavidNohejl

wrote on last edited by

#39

Quartz... wrote:

TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5

:zzz: log4^(1/5)(2+2) = 5 :cool: or, I think you could define group with only {2}, and call zero element "5". Then 2-2 = 5 :D

"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus
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R Raj Lal

Ist one sqrt( (.2) ^ (-2) ) [^] i can hear your "huh!" 2nd one as some of you have already guessed the mirror just reflect and our eye see the image horizontally . The reason why it appears to reverse left/right is because of the symmetry of our body. nice weekend

Omit Needless Words - Strunk, William, Jr.

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Rob Graham

wrote on last edited by

#40

Quartz... wrote:

The reason why it appears to reverse left/right is because of the symmetry of our body.

Symmetry has nothing to do with it. Perspective has everything to do with it.
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R Raj Lal

Ist one sqrt( (.2) ^ (-2) ) [^] i can hear your "huh!" 2nd one as some of you have already guessed the mirror just reflect and our eye see the image horizontally . The reason why it appears to reverse left/right is because of the symmetry of our body. nice weekend

Omit Needless Words - Strunk, William, Jr.

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Ed Poore

wrote on last edited by

#41

Um, where's the +? Besides what's so strange about that one? .2 = 1/5 (1/5)^(-2) = 5^2 sqrt(25)=5 The one I was on about is where there's a proof that 1=2.

I have no idea what I just said. But my intentions were sincere.

Poore Design
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R Raj Lal

In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

Omit Needless Words - Strunk, William, Jr.

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parths

wrote on last edited by

#42

int x = 2; (++x)+2 ... on some compilers :)

"It was when I found out I could make mistakes that I knew I was on to something." -Ornette Coleman "Philosophy is a study that lets us be unhappy more intelligently." -Anon.
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