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Answer:
I don't see any options available for me to choose from but, A thank you letter, a letter to a teacher/ employer, and a letter containing important information would all be times that you would want to send a formal letter.
Explanation: I hope this is helpful...?
Answer: Formal letters are effective for conducting business or just casual communications with a friend.
Explanation: I hope this helps I guess, there were no options to choose from