a.rb

x = 10000000
y = 0

x.times do
  a=[]
  14.times do
    b = rand(10)
    a.push(b) #if !a.include?(b)
  end
  y += 1 if !a.include?(0) && !a.include?(3) && !a.include?(4) && !a.include?(7)
end

puts "#{y}/#{x}, #{y.to_f/x.to_f}"