Even and prime numbers
One circle for the even numbers, one for the primes, and the question of what goes in the middle. Only 2. Every other even number divides by 2, so it cannot be prime.
Of the numbers from 1 to 100, 50 are even and 25 are prime. The circles are drawn to those sizes, which makes the overlap a sliver with one number in it.
| Even | 50% |
|---|---|
| Prime | 25% |
| Even & Prime | 1% |