Public
Edited
Apr 18, 2023
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numberOfBridgeDeals = permut(52,13)*permut(39,13)*permut(26,13)
function probabilityOfABirthdayMatch(n,days) {
// https://en.wikipedia.org/wiki/Birthday_attack#Mathematics
return 1 - Math.exp(-n*(n-1)/2/days)
}
1/probabilityOfABirthdayMatch(1e12,numberOfBridgeDeals)
function permut(n,m) {
if (m == 0) return 1;
if (m == 1) return n;
if (m > n/2) return permut(n,n-m);
return Math.round(n/m*permut(n-1,m-1));
}
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