in
[전치사]
used to indicate that something or someone is part of a particular group, place, or thing

안에, 중에
on
[전치사]
used to indicate that something is included as part of a group, category, or set

~에 포함되어 있는, ~의 일부로
Ex: They voted on the council .
number out of number
[전치사]
used to indicate the number or proportion of elements that meet a specific condition within a larger set

중에서의 비율, 중의 수

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