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2/4 Snooker balls

Which snooker ball arrangement is the odd one out?

The position of the yellow ball is key.

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How many months are there in a year?

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Regular
mosays...

57 is known as the "Grothendieck prime" because Alexander Grothendieck gave it as a prime number example.

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New
Cleosays...

131 is the only prime number

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