The Birthday Problem

Question

What's the probability of two people sharing the exact birthday? (dd-mm-yyyy)

wallflower · Accepted Answer

It is similar to the problem of grocery checkout. If there are n checkout lines, the probability of being in the quickest line is 1/n, assuming that all checkouts have lines.It is probably 1/(how many possible birthdays in a given year range). To be conservative (90 years): 1/90*365 or 0.003%.

pwg · Answer

1) Open browser2) Navigate to https://duckduckgo.com/3) Type in "!w birthday problem" (without the quotes)4) Read the wikipedia page that appears

The Birthday Problem

What's the probability of two people sharing the exact birthday? (dd-mm-yyyy)

It is similar to the problem of grocery checkout. If there are n checkout lines, the probability of being in the quickest line is 1/n, assuming that all checkouts have lines.
It is probably 1/(how many possible birthdays in a given year range). To be conservative (90 years): 1/90*365 or 0.003%.

1) Open browser
2) Navigate to https://duckduckgo.com/
3) Type in "!w birthday problem" (without the quotes)
4) Read the wikipedia page that appears