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def add(*numbers) numbers.reduce(:+) # or numbers.inject(0) { |sum, number| sum + number } end def subtract(*numbers) numbers.reduce(:-) # or numbers.inject { |subtraction, number| subtraction - number } end def calculate(*arguments) options = arguments.last.is_a?(Hash) ? arguments.pop : {} if options[:add] then add(*arguments) elsif options[:subtract] then subtract(*arguments) else add(*arguments) end end

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