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some_range = 1..3

puts some_range.max # => 3

puts some_range.include? 2 # => true

puts (1...10) === 5.3 # => true

puts ('a'...'r') === "r" # => false (end-exclusive)

p ('k'..'z').to_a.sample(2) # => ["k", "w"]

# or another random array with 2 letters in range

age = 55

case age

when 0..12 then puts "Still a baby"

when 13..99 then puts "Teenager at heart!"

else puts "You are getting older..."

end

# => Teenager at heart!