Odds or Sixes?

Stage: 2 Challenge Level: Challenge Level:1
Tania and Derek are playing a game with one die.
They throw the die. If the number on the die is odd, Tania wins that round.
If the number on the die is a six, Derek wins.
(It doesn't matter who throws the die.)
Who is more likely to win the game? Why?
How could you make the game fair?

You might like to use the interactivity below which will mimic throwing a die many times.
Full Screen Version
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Published November 2005,December 2005.