gistfile1.rb

def multiples(num,max)
	ret_val = []
	max.times() do |i|
		ret_val << i if i%num == 0
	end
	ret_val
end

require 'set'

divisors = Set.new
divisors.merge( multiples(3, 1000) )
divisors.merge( multiples(5, 1000) )

pretty_print = divisors.to_a.sort { |x,y| x <=> y }
puts pretty_print
puts "total #{pretty_print.inject(:+)}"