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Answer to Question #45329 in MatLAB | Mathematica | MathCAD | Maple for Akshay Joshi

Question #45329
The Birthday Problem: The birthday problem is stated as follows:
If there is a group of n people in a room, what is the probability that two or more of them having same
birthday? It is possible to determine answer to this question by simulation. (Hint: You can generate
random dates, n times and determine the fraction of people who born in a given day). Write a function
that determines the answer to this question by simulation. The program you write can take n as the
input and prints out the probability that two or more of n people will have the same birthday for
n=2,3,4…. 40
Expert's answer
close all; clear all; clc;
date_min = datenum([1960 1 1]); % start date
date_max = floor(now);  % current date
N = 40;
P = zeros(1,N-1);
for n=2:N
date_r = randi([date_min date_max], 1, n);   % random day
date_r_d = datevec(date_r);  
d = date_r_d(:,3);
m = date_r_d(:,2);
  c = 0;
for i = 1:n
for j = 1:n
if m(i) == m(j) && d(i) == d(j) && i ~= j
  c = c + 1;
end
end
  end
  P(n-1) = c/n;
end
P

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