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Well, let's see ...

If it's between 20 and 30, then its ten digit has to be 2.

And if its ten digit is 2, then its one digit has to be 9.

So the real question we have to answer is: "Is 29 a Prime number ?"

The answer is: Yes. So that must be it.

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13y ago

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Q: What is the prime number between 20 and 30 one digit is 7 greater than its ten digit?
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