of the three vs of all three - English Language Usage Stack Exchange Both are correct You would usually use "A is the oldest of the three" if you were talking about three people from a larger group e g three girls who have two brothers, while you would use "A is the oldest of all three" if there were only three in the group e g three girls with no brothers
Why is it three score years and ten almost half the time and not . . . 3 Why is it 'three score years and ten' almost half the time and not always 'three score and ten years'? Note: I edited the question body and title in light of comments and answers pointing me to a Google phrase frequency chart which indicates that the two versions are used about equally often right now