Odd man out...

...is the handy dandy title to today's handy dandy discount MENSA calendar Brain Bender.

Ready to play?

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Which of these three digit combinations below is least like the others?

• 639
• 439
• 216
• 997

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Just for the record, I have no idea.... I'm off to make toffee.... And wrap gifts... And... Uh... More stuff like that.....

And like always the answer will be found in the comments later. See you then!