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lbvf50mobile/lamandy.rb Secret

Created December 5, 2017 19:07
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lamandy.rb
def number_of_varitans y
s = y.size
z = y.count(0)
d = (y - ['0']).uniq.size
( s - z) * f( s - 1 )/( f(z) * f(d)) # https://stackoverflow.com/a/47616628/8574922
end
def f n
(1..n).inject(:*) || 1
end
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