Which of these idiomatic phrases is grammatically correct?

This expression was originally used very literally for physical objects such as houses appearing at widely separated intervals. Today it is also used more loosely to connote "not very many or not appearing very frequently". For instance - "he grew up at a time when jobs were few and far between". It is not uncommon to see this expression often misused, misspelled, or mispronounced. Most common mistakes include misstatements like "few and far inbetween" or the addition of hypens in the phrase.