2 in one dress - Fashion Style
Who What Wear on MSN: Every fashion person needs at least one dress, skirt, or top in this color for spring Every fashion person needs at least one dress, skirt, or top in this color for spring Yahoo: 20 Pretty Target Dresses For Anyone Looking For A One-And-Done Ensemble One-to-one is used when you talk about transfer or communications. You may use one-to-one when you can identify a source and a destination. For eg., a one-to-one email is one sent from a single person to another, i.e., no ccs or bccs.
Understanding the Context
In maths, a one-to-one mapping maps one element of a set to a unique element in a target set. One-on-one is the correct adjective in your example. See Free ... "Which one is the best" is obviously a question format, so it makes sense that " which one the best is " should be the correct form.
Image Gallery
Key Insights
This is very good instinct, and you could even argue that the grammar is good, but at best it's unnatural. With one or more is / are, the first thing to consider is whether 'one or more' is a unit or analysable. It has the near-synonym 'some'; 'four or five' could be substituted reasonably by 'several'. Which is correct: "one or more is" or "one or more are"? 101: One hundred and one 234,500: Two hundred and thirty four thousand five hundred Based on my experience, Britons, Australians and New Zealanders say the "and", and North Americans do not (ie "one hundred one", etc).
Final Thoughts
I believe most other English speaking countries say the "and". Which version was used first?