The last furniture is wrong, this formula is verified, and it will never be wrong again ^ _ ^.
a. 50 people possible birthday combination is 365 * 365 * 365 * ... * 365 (a total of 50).
b. 50 people have no repetition combinations from 365 * 364 * 363 * ... * 316 (a total of 50).
c. 50 people have a duplicate probability of 1 - A / B
code show as below:
#include
#include
Using namespace std;
Unsigned int N = 50;
Unsigned int m = 365;
int main ()
{
Long Double P = 1.0;
For (unsigned int = 0; i p * = (1- (double) I / m); P = 1-P; Cout << p << endl; System ("pause"); Return 0; } The output result is: 0.97 But unfortunately, Long Double is not accurate enough, so I change M to 3, N is changed to 0, 1, 2, 3, 4, 5 to test, results and actual 0/3 chance is 0 1/3 chance is 0 2/3 chance is 1/3 3/3 chance is 7/9 4/3 chance is 1 5/3 chance is 1 Posted on 2005-01-07 23:17 Zhou Xingxing Read (585) Comments (12) edit Collect href = "http://blog.vckbase.com/bruceteen/services/pingback.aspx" Rel = "pingback" /> comment # Re: 50 people have the same birthday probability of 97% 2005-01-08 04:32 Liao Qian The probability is really high, there are 4 people in the people I know and I have one day. # o 2005-01-08 05:14 Purple crystal ....... # Re: 50 people have the same birthday probability of 97% 2005-01-08 10:11 Male Did not consider the leap year # Re: 50 people have the same birthday probability of 97% 2005-01-09 10:53 Bayes This is a classic probability question, often used to explain that your feelings are extremely unreliable. . . I have previously calculated that 23 people can guarantee that some people have the same birthday, huh, huh! Many people didn't think! # Re: 50 people have the same birthday probability of 97% 2005-01-12 11:16 Ishou The results obtained using the super precision software (no distortion after the decimal point): 0.97037357957798839991865520436840386588 # Re: 50 people have the same birthday probability of 97% 2005-01-12 11:32 Ishou The probability of 23 people is: 0.50729723432398540722541722833703250025 The probability of 30 people is: 0.70631624271926865995623965867730366181 The probability of 35 people is: 0.81438323887471523275939529078225043834 The probability of 41 people is: 0.90315161148173540173928850723367156802 # Re: 50 people have the same birthday probability of 97% 2005-01-12 11:39 Ishou The probability of 221 people is: 0.99999999999999999999999999999999999999 # Re: 50 people have the same birthday probability of 97% 2005-01-12 13:28 Shanghai Years Will n't so much? # Re: 50 people have the same birthday probability of 97% 2005-01-17 03:07 Mouse love rice online audition appreciation I am not trust! ! ! ! ! ! # TO mouse love rice online audition appreciation: 2005-01-17 04:49 Zhou Xingxing In fact, the chance is much higher than this, because many people like to choose season hours. # Re: 50 people have the same birthday probability of 97% 2005-02-19 13:58 Sexman Blow, blow # Re: 50 people have the same birthday probability of 97% 2005-02-20 18:45 Quad > I am not trust! ! ! ! ! ! There is this question in the high school mathematics book. Isn't you graduated in high school? # Re: 50 people have the same birthday probability of 97% 2005-01-08 04:32 Liao Qian The probability is really high, there are 4 people in the people I know and I have one day. # o 2005-01-08 05:14 Purple crystal ....... # Re: 50 people have the same birthday probability of 97% 2005-01-08 10:11 Male Did not consider the leap year # Re: 50 people have the same birthday probability of 97% 2005-01-09 10:53 Bayes This is a classic probability question, often used to explain that your feelings are extremely unreliable. . . I have previously calculated that 23 people can guarantee that some people have the same birthday, huh, huh! Many people didn't think! # Re: 50 people have the same birthday probability of 97% 2005-01-12 11:16 Ishou The results obtained using the super precision software (no distortion after the decimal point): 0.97037357957798839991865520436840386588 # Re: 50 people have the same birthday probability of 97% 2005-01-12 11:32 Ishou The probability of 23 people is: 0.50729723432398540722541722833703250025 The probability of 30 people is: 0.70631624271926865995623965867730366181 The probability of 35 people is: 0.81438323887471523275939529078225043834 The probability of 41 people is: 0.90315161148173540173928850723367156802 # Re: 50 people have the same birthday probability of 97% 2005-01-12 11:39 Ishou The probability of 221 people is: 0.99999999999999999999999999999999999999 # Re: 50 people have the same birthday probability of 97% 2005-01-12 13:28 Shanghai years Will n't so much? # Re: 50 people have the same birthday probability of 97% 2005-01-17 03:07 Mouse love rice online audition appreciation I am not trust! ! ! ! ! ! # TO mouse love rice online audition appreciation: 2005-01-17 04:49 Zhou Xingxing In fact, the chance is much higher than this, because many people like to choose season hours. # Re: 50 people have the same birthday probability of 97% 2005-02-19 13:58 Sexman Blow, blow # Re: 50 people have the same birthday probability of 97% 2005-02-20 18:45 Quad > I am not trust! ! ! ! ! ! There is this question in the high school mathematics book. Isn't you graduated in high school?
