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Understanding the Context

For years, Iโ€™ve heard a simple framing repeated in B2B organizations: Sales is one-to-one selling, and marketing is one-to-many selling. The idea is usually well-intended, and at a high level, it ... 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.

Key Insights

For eg., a one-to-one email is one sent from a single person to another, i.e., no ccs or bccs. 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.

Final Thoughts

This is very good instinct, and you could even argue that the grammar is good, but at best it's unnatural. 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). I believe most other English speaking countries say the "and". Which version was used first? Which came first when saying numbers: "one hundred AND one" or "one ... How one and one's is different from other indefinite pronouns The possessive of one (one's) is formed the same way as the possessive of other indefinite pronouns, such as someone (someone's), but it is used a bit differently.

For most people, one is consistently used with the possessive form one's. 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'.