1. He is the oldest of the three.
2. he is the oldest of three.
(Which one is right?)
They are both correct.
number 1 is correct because the H is capital.
Both sentences are grammatically correct, but they have slightly different meanings.
1. "He is the oldest of the three." - This sentence implies that there are three individuals, and the person referred to as "he" is the oldest among them.
Example: If there are three siblings, John, Mark, and James, and John is the eldest, we can say, "He is the oldest of the three," referring to John.
2. "He is the oldest of three." - This sentence suggests that there is a group of three objects or concepts, and the person referred to as "he" is the oldest among them.
Example: If you have three cars, and the person talking says, "He is the oldest of three," they are referring to one of the cars, saying it's the oldest out of the three cars.
So, the choice between the two depends on the context and whether you are comparing people or objects/concepts.