You have to be lucky and guess correctly. There is no formula to do this - so you may or may not guess the correct number or numbers.
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13 is a prime number between 1 and 100. There are 24 others.
I'm not sure what you mean,but I'm guessing 51-99.
97 is the highest prime number between 1 and 100.
Halfway between 70 and 100 is (70 + 100) ÷ 2 = 85.
There are infinitely many numbers between 39 and 100.