simeonwillbanks · June 2, 2011 05:27
diff --git a/permutations.rb b/permutations.rb
 # Permutations without Repetition
 # 
 #    n!
 # --------
 #  (n-r)!


 def permutations(total)
  (total-1).downto(1) do |i|
    total = total * i unless i == 0
  end
  total
 end

 puts permutations(16) # => 20922789888000
	# Permutations without Repetition
	#
	# n!
	# --------
	# (n-r)!


	def permutations(total)
	(total-1).downto(1) do \|i\|
	total = total * i unless i == 0
	end
	total
	end

	puts permutations(16) # => 20922789888000