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connorjclark/gist:3ab613a959d9c565a976

Created May 23, 2015 05:09
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gistfile1.rb
def play
cards = (-10..10).to_a - [0]
sum = 0
begin
sum += cards.delete_at(rand(cards.length))
end while sum != 0
20 - cards.length
end
num_trials = 100000
average = num_trials.times.map {
play
}.inject(0.0) { |acc, e|
acc + e
} / num_trials
puts average
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