Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 Re: Help Me ! » Coincidence » 2012-06-01 02:16:47
bobbym,Administrator,
Thank you! 
#2 Help Me ! » Coincidence » 2012-05-31 20:16:58
- loong1234
- Replies: 34
Example:
you are in a room with 30 people, and find that Zach and Anna celebrate their birthday on the same day.
Would you say "wow, how strange", or "that seems reasonable, with so many people here".
In fact there is a 70% chance that would happen... so it is likely.
Why is the chance so high?
Because you are comparing everyone to everyone else (not just one to many).
And with 30 people that is 435 comparisons.
my question is: how to get the 70 % and 435 comparisons? thx
Pages: 1