(1..4).inject {|sum, n| sum + n*n } # => 30class Person attr_accessor :name, :age def initialize(name, age) @name = name @age = age end end # Create an array of Person objects people = [ Person.new("Alice", 30), Person.new("Bob", 35), Person.new("Charlie", 25) ] # Iterate over the array and print each person's name and age people.each do |person| puts "#{person.name} is #{person.age} years old" end