# Same birthday probability (chart) Calculator

## Calculates a table of the probability that one or more pairs in a group have the same birthday and draws the chart.

 n ~personsin a group
(1) the probability that all birthdays of n persons are different.

(2) the probability that one or more pairs have the same birthday.

This calculation ignores the existence of leap years.
Same birthday probability (chart)
 [1-9] /9 Disp-Num5103050100200
[1]  2020/03/10 16:05   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
Helped me verify my calculations for a mathematical exploration on this topic,
[2]  2017/05/08 15:05   Male / 20 years old level / High-school/ University/ Grad student / Very /
Purpose of use
Study for Midterm in Discrete Math
Comment/Request
Thanks useful formula for many similar problems
[3]  2015/06/24 21:44   Male / 60 years old level or over / An office worker / A public employee / Very /
Purpose of use
counter-intuitive? yes. explanation better? no, but it's a good explanation... i guess.
[4]  2015/06/19 06:03   - / 50 years old level / A homemaker / Very /
Purpose of use
to play with the numbers.
[5]  2015/05/09 10:55   Male / 60 years old level or over / A retired people / Very /
Purpose of use
Idle chat among men over coffee.
[6]  2014/04/10 03:39   Female / 60 years old level or over / A teacher / A researcher / Very /
Purpose of use
doing a math workshop with an activity called "Do you have a birthday twin?". I wanted to give the teachers at the workshop some stats on this question.
[7]  2014/01/13 23:57   Female / 40 years old level / An office worker / A public employee / Very /
Purpose of use
[8]  2013/09/16 12:19   Male / 30 years old level / An office worker / A public employee / Very /
Purpose of use
Personal interest.
[9]  2009/12/28 19:49   Male / Under 20 / A high school student / Very /
Purpose of use
Calculate high precision operations that are unable to run on Casio Calculators.
Comment/Request
Very impressed. But there are sites where you could operate multiplications within five hundred thousand digits. Maybe Casio can do some more to improve.

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