All Questions
7
questions
1
vote
1
answer
121
views
Which would be the "direct" formula for the birthday paradox , withouth subtracting to 1?
I stumbled upon the birthday paradox, and I get it.
However, all the explanations I see solve the probability by subtracting to 1 the probability of all people having different birthdays. What I am ...
- 155
3
votes
1
answer
104
views
Solving Birthday Paradox with Triangular Number formula
I have an incorrect solution to the classic birthday paradox question, and while plugging in some values shows the formula is wrong, I can't see any intuitive reasoning as to why it is incorrect, or ...
- 33
0
votes
2
answers
307
views
Using R, solve the birthday paradox
The probability that two students in a class have the same birthday is at least 75%. What is the minimum size of the class?
I tried,
...
- 21
2
votes
1
answer
62
views
My try of the Birthday Paradox
I have seen the solution of the paradox on Wikipedia, but before that I tried it out myself. But I got my answer wrong with my approach.
To calculate the probability of no two people in a group of 23 ...
- 21
1
vote
2
answers
1k
views
Other days of the week - Birthday Paradox
I'm trying to solve a birthday paradox problem, I'm really close to the answer but I guess I'm doing something wrong. The problem states that the probability of being born on a friday is $\frac{1}{3}$ ...
- 137
0
votes
3
answers
683
views
Calculate Inclusion-Exclusion in Birthday Paradox
Follow-on from this post
I was trying Birthday Paradox for 5-day calendar, with 3 people
The probability that NONE of them have matching birthday is
$5/5 * 4/5 * 3/5 = 0.48$
The probability there ...
- 453
3
votes
4
answers
3k
views
Explain the Birthday Paradox
I recently read about the Birthday Paradox which states that in a group of 23 people, there's a probability of 50% that 2 people share their birthday, probability wise.
I calculated and don't think ...
- 203