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Is there a single word or compact term for a bet where you are guaranteed to get your input back?

Say you bet $1 on a dice roll and get $1 for each eye on the dice roll. Since the dice has a minimum of one eye, you are getting your input of $1 back no matter what.

This of course is a very bad bet for the bank.

But how is that called?

  • A safe bet ?.... – user66974 Apr 15 '15 at 19:55
  • @Josh61 Make that an answer. But as a non-native I always thought a safe bet was a bet with a *very high winning probability, but not 100%. – Lars Ebert Apr 15 '15 at 20:06
  • A safe bet: a bet that is certain to succeed. oxforddictionaries.com/definition/english/safe-bet – user66974 Apr 15 '15 at 20:20
  • @Lars: Logically, if the probability is 100% that should be conveyed by it's a racing cert or a sure thing. But in practice whenever someone gives you an assurance like that, you start looking for the pitfalls. – FumbleFingers Apr 15 '15 at 20:35
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A sure thing:

An outcome that is certain or assured; a certainty; something guaranteed to be successful; something that is or should be a certain success, as a bet. - TFD

The Picasso Signature Is Still a Sure Thing - NYT

Also, a foregone conclusion:

An end or a result regarded as inevitable:

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I'm not sure that even qualifies as bet.

A bet usually implies the risk of losing the initial money, but in this case the risk is just not there.

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