certainty vs roll of the dice

certainty

noun

  • An instance of being certain. 

  • The state of being certain. 

  • A fact or truth unquestionably established. 

roll of the dice

noun

  • A risky or uncertain attempt to do something, especially in an unfavourable situation. 

How often have the words certainty and roll of the dice occurred in a corpus of books? (source: Google Ngram Viewer )