The problem involving the likelihood that two people share the same birthday. At around 23 people group, there is a 50% chance of two people having the same birthday.
Example
What is probability that 2 students out of a class of 24 have same birthday? n(s) = 365^24. total possibilities 365 days in a year. 24 students. Student permutations: order matters, we decide a different birthday for different people. = 1.44e^61 The probability that they have different is: = 0.4617 So, the probability they have same is: 1 - 0.4617 = 0.5383 53.83% likelihood.