Math Is Fun Forum

I've come across this weird little puzzle,

Infinity - Infinity = ???

Now when you first look at this you might think it equals zero. But look at it like this:

If you have infinity marbles and you give infinity (As in all of them) to someone else then infinity - infinity = nothing.
But if you have infinity marble numbered 1, 2, 3 etc. and gave every second marble to someone then infinity - infinity = infinity
BUT if you give someone else all the marbles numbered 3 or above (Which is infinity marbles) then infinity - infinity = 2.
But the question is in all these examples are you really giving infinity marbles away and do you still have infinity (Or whatever) left???

What do you guys think anyway?:)

Regnar

Hi, I'm new here and just wanted to post an awesome way to remember pi up to 30 decimal places!

To remember it you must remember this "poem":

For I must a verse prescribe,
By artful sense and words describe,
Rhyming's Cryptic Chemistry,
Bit by bit, wiggling free,
Circle by circle, soon you see,
sketched out in Grecian Schoolery.

The secret to getting PI out of it is to count the number of letters in each word. (3.1415926535897...) and you get PI to 30 decimal places!
This has definately helped me in exams!:D
Hope it helps, anyway,
Regnar.