Who do you think I met/met with ?
Considering formal usage of English do we need to use preposition with with met in the above given sentence ? I tried to google about it but couldn't find anything reliable.
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Since you mention "formal" you might prefer "With whom do you think I met?"
There is a small difference in meaning between "meet", and "meet with". The former suggests a short chance event. "I met John at the shops". The latter suggests a planned meeting. "I met with John to discuss our plans" This distinction is flexible and not always observed.
Hence use "Who do you think I met with" to ask "Who do you think I had a planned meeting with". And "Who do you think I met?" to ask "who do you think I bumped into"
In either case, asking such a question is very conversational, rather than formal.