Test de inteligență | Unul singur dintre aceste 4 numere este prim: 207, 717, 777 sau 997. Care?

A new logic exercise challenges individuals to identify a prime number among four options: 207, 717, 777, and 997. The task involves applying simple divisibility rules, particularly checking for divisibility by 3. The only prime number in the set is 997, as the others can be divided by 3. Such tests are popular online and serve to enhance cognitive skills like memory and attention. While intelligence tests assess cognitive abilities and IQ levels, online challenges primarily aim for entertainment and attention training.