Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2012-12-03 05:51:39

Registered: 2012-12-03
Posts: 27

Origami probabilty problem

Say you have identical sheets of paper, and you take one sheet and make a random crease in that sheet of paper, what is the probability that if someone else folds a random crease in one of the other sheets that it will be the exact same crease. I figured it would be 1/infinity, but what If the second person was allowed to make 5 random creases in the second sheet what would the probability that 1 of those creases was identical to the original crease... 5/infinity?

If so what is the difference between 1/infinity and 5/infinity?



#2 2012-12-03 06:06:30

bob bundy
Registered: 2010-06-20
Posts: 7,501

Re: Origami probabilty problem

In practice, creases are not infinitely thin so I think the probabliity is not 1/∞, but rather some very small fraction that depends on the paper etc.

But if you were right about the 1/∞ and 5/∞ , these are both zero.

(There have been many arguments about infinity related topics on MathIsFun, so you may have accidentally set them off again.) 


Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei


#3 2012-12-03 07:24:07

Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,000

Re: Origami probabilty problem

Yes, both probabilities are zero.

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.


Board footer

Powered by FluxBB