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esquinas/birthday_collision.rb

Created August 14, 2018 14:23
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Calculate percentage probability of birthday collisions (Birthday paradox) in Ruby
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birthday_collision.rb
def prob_of_birthday_collision(people = 23.0, days = 365.25)
e = Math::E
k = people.to_f()
n = days.to_f()
return 100.0 * (1.0 - e**((-k * (k - 1.0)) / (2.0 * n)))
end
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