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Used to refer to each member of a group or all of something collectively.
このチームのメンバーはいずれも優秀です。
All members of this team are excellent.
いずれも正しい答えです。
All of these are correct answers.
Often used in formal or written contexts to emphasize inclusivity.
'いずれも' is more formal than '全て' and is often used in writing or formal speech.
Always refers to all members of a group, never just some.
Derived from 'いずれ' (which one) + 'も' (also), emphasizing inclusivity.
Can be used interchangeably with '全て' (minna) in many contexts, but 'いずれも' is more formal.