The first example is incorrect. The second and third examples are both correct. Which one you use is mostly a matter of preference, although a hundred appears more frequently than one hundred. There. You typically wouldn't use either phrase for meetings. 'One-to-one' is rare and often technical in any case, you might say, 'On most websites there is a one-to-one relationship between a username and. The difference is that "one" puts more emphasis on the number such as I have 4 computers and a printer/I have 4 computers and only one printer. So when you say a feature of my work or one feature.

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