## Mathematical Proof Required

Posted by Karl Sharman on July 15, 2011 – 8:48 am

What unknown value can you add to 1 in order to get one less?

Posted by Karl Sharman on July 15, 2011 – 8:48 am

What unknown value can you add to 1 in order to get one less?

July 15th, 2011 at 10:52 am

‘get one less’ … than what? one less than 1? one less than the unknown value?

1 + x = 1 – 1

x = -1

1 + x = x – 1

1 = -1 … not possible

July 15th, 2011 at 12:39 pm

I could be oversimplifying here, but is the answer -1; ‘One less’ being equal to 0 and all.

1 + x = 0

x = -1

July 15th, 2011 at 1:20 pm

cazayoux, you are adding to one to get one less than one…

BearSprite – this is me being picky, but I am looking for an unknown value – Minus 1 is kinda, well, y’know – known

July 15th, 2011 at 1:34 pm

When in Rome, do as the Romans do. X = 10, IX = 9.

July 16th, 2011 at 12:30 am

Sorry Chris, but X isn’t 1. Good answer though, but like BearSprite’s answer, the I you are adding has a known value.

Be prepared to send me straight to hell when you see the answer… This is a ToM question after all….

July 16th, 2011 at 6:51 am

-1 is the correct answer.

July 16th, 2011 at 6:54 am

1+iota sq.

=1+(-1)

=0

so basically iota square is the answer….

July 16th, 2011 at 7:09 am

The Roman numeral X for 10. Add 1 and you get IX or 9.

July 16th, 2011 at 2:43 pm

I think the key lies in interpreting “one less”. It could be -1, as that is one less than 0 which is a number one would normally use for comparing in addition or subtraction (just like 1 would be for division or multiplication). In a more relative sense, it could be 0, since that is one less than the number already used in the question, 1. Or it could be something entirely different.

I don’t have an answer at the moment, actually. But I can at least say that 1,2,4,7,8 are not correct.

July 17th, 2011 at 8:42 am

-1x where (x=1)

1*-1x=-1

July 17th, 2011 at 1:45 pm

An unknown value implies a variable value.

An actual number like -1 can’t be used since it is a known value. In mathematical notation the letter ‘n’ is used to denote an unknown/variable number.

The variable ‘n’ can be added to the word ‘one’ to get ‘none’, which is one less than one.

I’m going straight to hell for this one!!! In my defence, it was posted as a ToM question, not a Maths question….?

July 17th, 2011 at 3:03 pm

Hi Karl. LOL. I prefer x as the unknown value. That’s why I liked ix.

July 18th, 2011 at 4:55 am

1+(-2)=-1

July 18th, 2011 at 7:28 am

Sorry sandeep – ‘-2′ has a known value, and ‘-1′ is two less than one. Post 11. is the correct answer….

July 18th, 2011 at 9:37 am

Rich’s answer can also be taken as correct!!

July 18th, 2011 at 9:42 am

Hey, can anybody help me to register! The site is saying your registration is disabled!

July 18th, 2011 at 12:41 pm

Sorry Ayush – Rich is using known values! I = 1 and X = 10.

You should be able to register under Blogroll on the right hand side of the site. If this isn’t working, try again in a few hours – there may be a glitch, also if you are using an newer Internet Explorer ensure the compatibility button is on….?

July 19th, 2011 at 12:19 am

we add {+5-5} so we get one less

July 20th, 2011 at 5:18 am

Listen man!!!! the square of “i” is the answer where “i”= square root of minus one!! as in imaginary no.!!! and It SEEMS “i” is UNKNOWN!! soo is it the answer….??

July 20th, 2011 at 6:02 am

Peeps, Karl (the problem poster) has give the official answer in post 11.

Sankalp, “i” (square root -1) is not unknown, so it doesn’t seem to be unknown either.

July 21st, 2011 at 4:30 am

1+(-1)=0

-1 is the ans

July 26th, 2011 at 10:53 am

equation:

1+(x)=0

answer:

1+(-1)=0

proof:

0-(-1)=1