Answer:
A prime triplet is a set of three prime numbers that are consecutive and differ by 2 (e.g. 3, 5, 7). The first prime triplet is (3, 5, 7), and it is well known that there are no other prime triplets. There is only one prime triplet that exist.
It is important to note that the concept of prime triplet is not commonly used in number theory and there are not many studies that focus on counting the number of prime triplets. Also, it is not known if there are an infinite number of prime triplets or not.
Explanation: